Air Quality Index Chart: AQI Scale and Health Effects

The Air Quality Index (AQI) serves as your health protection guide during pollution events. This numerical scale shows how clean or polluted your air is and what health risks you face. Understanding the AQI chart helps you make smart decisions about outdoor activities and protective measures. This guide breaks down every AQI level, explains health implications for different groups, and provides practical protection strategies tailored to Indian conditions.

What is the Air Quality Index (AQI) and Why is it Important?

The Air Quality Index (AQI) is a standardized system used to communicate how polluted the air is and what associated health concerns you should be aware of. Developed and implemented by the Central Pollution Control Board (CPCB) in India, the Air Quality Index transforms complex pollution data into simple numbers from 0 to 500 that anyone can understand.

Unlike raw pollutant measurements that require scientific knowledge to interpret, the AQI converts concentrations of major air pollutants into a single value that indicates potential health impacts. In India, the AQI calculation includes six primary pollutants:

• Particulate Matter below 2.5 micrometers (PM2.5)
• Particulate Matter below 10 micrometers (PM10)
• Nitrogen Dioxide (NO₂)
• Sulfur Dioxide (SO₂)
• Carbon Monoxide (CO)
• Ozone (O₃)

The AQI serves as a crucial public health communication tool. It allows government agencies to warn citizens when air pollution reaches unhealthy levels and helps individuals make informed decisions about outdoor activities. For people with respiratory conditions, children, and the elderly, these warnings can be particularly important for preventing serious health complications.

Complete AQI Scale Chart: Categories and Color Codes Explained

The Indian AQI scale consists of six color-coded categories ranging from Good (0-50) to Severe (401-500), each representing different levels of health concern. Understanding these air quality colors and their meaning helps you quickly assess risk levels and take appropriate action.

Here’s a breakdown of each AQI category:

• Good (0-50, Green): Air quality is considered satisfactory with minimal or no health risk.
• Satisfactory (51-100, Light Green): Air quality is acceptable, though there may be moderate health concerns for a very small number of unusually sensitive people.
• Moderately Polluted (101-200, Yellow): Members of sensitive groups may experience health effects, while the general public is less likely to be affected.
• Poor (201-300, Orange): Everyone may begin experiencing health effects, with sensitive groups experiencing more serious effects.
• Very Poor (301-400, Red): Health warnings of emergency conditions for sensitive groups, with the general population likely to be affected.
• Severe (401-500, Dark Red): Health alert, with everyone likely to experience serious health effects.

It’s worth noting that Indian AQI standards differ somewhat from international ones. For example, the US Environmental Protection Agency (EPA) uses a scale that considers AQI values above 300 as “Hazardous,” while the Indian system extends to 500. The World Health Organization (WHO) guidelines for air quality are even stricter than both systems.

These differences exist because each country adapts air quality standards based on local conditions, available technology, and policy considerations. India’s higher thresholds reflect the challenging air pollution scenario in many urban centers, where readings frequently exceed levels seen in many other countries.

How to Read and Interpret AQI Charts

Reading an AQI chart correctly helps you make informed decisions about your daily activities and health protection strategies. Here’s how to interpret the information:

1. Check the current AQI number: This is the primary value that indicates overall air quality.
2. Note the color code: Colors provide an instant visual cue about severity, from green (good) to dark red (severe).
3. Identify the dominant pollutant: Often indicated alongside the AQI, this shows which specific pollutant is causing the most concern.
4. Consider the time frame: AQI readings may represent real-time values or 24-hour averages.

Many people misinterpret AQI readings by failing to recognize the difference between real-time values and 24-hour averages. Real-time readings can fluctuate significantly throughout the day, while the 24-hour average provides a more stable picture of air quality over time.

Another common misconception is assuming that all monitoring stations in a city show identical readings. In reality, air quality levels near you may differ substantially from across town due to local pollution sources, traffic patterns, and geographical features.

Health Effects at Each AQI Level: Who is at Risk?

Different AQI levels affect your health in varying ways, with certain population groups facing higher risks even at lower pollution levels. Understanding these health implications helps you take appropriate protective measures.

Good (0-50):

• General Population: No health effects expected. Ideal conditions for outdoor activities.
• Sensitive Groups: Minimal risk, though extremely sensitive individuals with severe respiratory conditions might want to monitor their symptoms.

Satisfactory (51-100):

• General Population: Unlikely to experience any effects.
• Sensitive Groups: May experience minor breathing discomfort. Children with asthma should watch for early symptoms.

Moderately Polluted (101-200):

• General Population: Possible respiratory discomfort during prolonged exposure or physical activity.
• Sensitive Groups: More likely to experience irritation, coughing, or breathing difficulty. Should consider limiting prolonged outdoor exertion.

Poor (201-300):

• General Population: May experience breathing discomfort, throat irritation, and coughing. Should limit prolonged outdoor activities.
• Sensitive Groups: Significant aggravation of symptoms and decreased exercise tolerance. Should avoid all outdoor activities.

Very Poor (301-400):

• General Population: Respiratory illness symptoms may appear. Prolonged exposure may lead to health effects even in healthy individuals.
• Sensitive Groups: Serious aggravation of existing conditions. Risk of developing respiratory illnesses with continued exposure.

Severe (401-500):

• General Population: Healthy people will experience reduced endurance and significant respiratory symptoms. Everyone should avoid outdoor activities.
• Sensitive Groups: Serious risk of respiratory effects. May require medical attention. Should remain indoors with air purification.

According to studies by the Indian Council of Medical Research, long-term exposure to poor air quality (AQI above 200) is associated with increased risk of respiratory infections, chronic bronchitis, heart disease, stroke, and lung cancer. A 2019 study found that air pollution contributed to approximately 1.67 million deaths in India, with economic costs estimated at $36.8 billion.

Watch for symptoms like unusual coughing, wheezing, shortness of breath, eye irritation, throat discomfort, chest tightness, headaches, and nausea, as these may indicate adverse reactions to air pollution.

Vulnerable Populations: Special Considerations

Certain population groups face significantly higher risks from air pollution and require additional protective measures and monitoring.

Children: Their developing lungs, higher respiratory rates, and outdoor activity patterns make children particularly vulnerable. Studies from AIIMS (All India Institute of Medical Sciences) show that children exposed to high pollution levels face increased risk of reduced lung function, asthma development, and recurring respiratory infections.

According to Dr. Arvind Kumar, Chairman of the Institute of Chest Surgery at Medanta Hospital, “Children’s lungs develop until they are about 18 years old. Exposure to severe air pollution during these formative years can cause permanent damage and increased susceptibility to respiratory diseases throughout life.”

Elderly: Age-related decline in lung function, higher prevalence of pre-existing heart and lung conditions, and weaker immune systems make the elderly especially vulnerable. They often show effects at lower pollution levels than younger adults.

Pregnant Women: Research indicates that exposure to high AQI levels during pregnancy is associated with low birth weight, preterm birth, and possibly congenital defects. The Indian Journal of Medical Research has documented increased risk of pregnancy complications in areas with consistently poor air quality.

People with Respiratory Conditions: Those with asthma, COPD, bronchitis, or post-COVID respiratory issues experience amplified symptoms even at moderate AQI levels. These individuals should maintain daily medication regimens and adjust them according to air quality forecasts.

People with Cardiovascular Conditions: High levels of air pollution can trigger heart attacks, strokes, and arrhythmias in people with existing heart disease. Blood pressure medications may need adjustment during severe pollution episodes.

How is the Air Quality Index Calculated in India?

The calculation of AQI in India follows a specific methodology established by the Central Pollution Control Board (CPCB), converting raw pollutant concentrations into the index values you see in reports.

The CPCB uses a multi-step process:

1. Measuring pollutant concentrations: Monitoring stations across India measure the concentration of six criteria pollutants in the air.
2. Calculating sub-indices: For each pollutant, the measured concentration is converted to a sub-index using pollutant-specific formulas.
3. Determining the overall AQI: The highest sub-index value becomes the AQI for that location.

For example, if a monitoring station measures PM2.5 at 90 μg/m³, PM10 at 120 μg/m³, and SO₂ at 40 ppb, these would convert to sub-indices of approximately 160, 110, and 50 respectively. The overall AQI would be 160, based on the highest sub-index (PM2.5).

India’s Air Quality Index classification differs from international systems like the US EPA’s. For instance, a PM2.5 concentration of 90 μg/m³ would be classified as “Moderately Polluted” (AQI 101-200) in India, but would fall into the “Unhealthy” category (AQI 151-200) in the US system.

The CPCB operates over 250 monitoring stations across India, with data updated hourly on their SAMEER app and website. Urban areas typically have multiple monitoring stations, while rural areas have more limited coverage.

Why Do AQI Readings Vary Between Different Sources?

You may notice different AQI readings from various apps, websites, and monitoring stations for the same location, which can be confusing but has specific explanations.

These variations occur for several reasons:

• Different calculation methodologies: Some services use the Indian AQI standard, while others might use US EPA or European standards.
• Monitoring location differences: Stations even a few kilometers apart can show significantly different readings based on local pollution sources.
• Time lag in reporting: Some sources update hourly, others less frequently, creating temporal discrepancies.
• Averaging periods: Some report real-time values while others show 24-hour averages.
• Sensor technology: Professional-grade monitors used by government agencies are more accurate than low-cost sensors in consumer devices.

For the most reliable information, prioritize official sources like the CPCB SAMEER app and website, SAFAR (System of Air Quality and Weather Forecasting And Research), or state pollution control board websites. These sources use calibrated reference-grade monitors and follow standardized measurement protocols.

When comparing readings from different sources, always check which AQI standard is being used and whether you’re looking at real-time or averaged data.

Seasonal and Regional AQI Patterns in India

India experiences distinct seasonal and regional air quality patterns, with certain times of year and locations consistently showing higher pollution levels that require heightened awareness.

Seasonal AQI Patterns:

• Winter (October-February): Typically the worst period for air quality, especially in North India. Cold temperatures create temperature inversions that trap pollutants close to the ground. Diwali fireworks and agricultural stubble burning (particularly in October-November) create pollution spikes. Delhi’s AQI routinely exceeds 400 during winter months.
• Summer (March-June): Generally moderate pollution levels, though dust storms can cause temporary spikes. High temperatures sometimes contribute to ozone formation in urban areas.
• Monsoon (July-September): Usually the cleanest period as rainfall washes pollutants from the air. AQI levels often drop below 100 in many cities during heavy monsoon periods.

Regional Variations:

• Delhi-NCR and North India: Experiences the country’s most severe air pollution, particularly in winter. Geographical factors (landlocked location), population density, industrial activity, vehicular emissions, and crop burning all contribute to consistently unhealthy air quality levels.
• Mumbai and Western India: Coastal cities like Mumbai benefit from sea breezes that help disperse pollutants, resulting in comparatively better air quality than inland cities. However, construction dust and traffic emissions still create moderate pollution levels.
• Bangalore and Southern India: Generally enjoys better air quality than northern cities due to favorable geographical location, higher rainfall, and fewer temperature inversions. However, rapid urbanization and increasing vehicle numbers are causing gradual deterioration.
• Kolkata and Eastern India: Experiences moderate to poor air quality, with seasonal variations. The presence of wetlands and proximity to the Bay of Bengal somewhat mitigates pollution levels compared to landlocked cities.

Special pollution events like Diwali can cause AQI spikes of 50-100% above baseline levels in many cities. Similarly, agricultural burning seasons in Punjab and Haryana significantly impact air quality throughout the Indo-Gangetic plain, affecting cities hundreds of kilometers away.

Protection Strategies for Different AQI Levels

Taking appropriate protective measures based on current AQI levels can significantly reduce your exposure to harmful pollutants and minimize health risks. These recommendations are organized by AQI category with priority given to the most effective and accessible interventions.

Good (0-50):

• General population: No specific precautions needed. Enjoy outdoor activities.
• Sensitive groups: Good opportunity for outdoor activities. Carry rescue medication if you have respiratory conditions.

Satisfactory (51-100):

• General population: No specific precautions needed for short-term exposure.
• Sensitive groups: Consider reducing prolonged or heavy exertion outdoors if experiencing symptoms. Keep rescue medications handy.

Moderately Polluted (101-200):

• General population: Consider reducing prolonged outdoor exertion, especially near busy roads or industrial areas.
• Sensitive groups: Should reduce prolonged or heavy outdoor exertion. Keep windows closed during peak traffic hours. Consider using basic dust masks if outdoor activities are necessary.
• Indoor measures: Limit opening windows during peak pollution hours (morning and evening). Consider using wet microfiber cloths for dusting.

Poor (201-300):

• General population: Reduce prolonged or heavy exertion outdoors. Consider wearing N95/N99 masks for necessary outdoor activities.
• Sensitive groups: Avoid all outdoor physical activity. Wear N95/N99 masks when outdoors. Use air purifiers indoors if available.
• Indoor measures: Keep windows and doors closed. Use air purifiers with HEPA filters. Increase indoor plants known for air purification properties.
• Travel adjustments: Consider carpooling or public transport to reduce vehicular pollution. Try to travel during off-peak hours.

Very Poor (301-400):

• General population: Avoid prolonged outdoor activities. Wear N95/N99 masks when outdoors. Use air purifiers at home and workplace.
• Sensitive groups: Stay indoors as much as possible. Ensure proper medication and follow doctor’s advice for adjusting treatment plans.
• Indoor measures: Create a clean air room using portable air purifiers. Use wet mopping instead of sweeping. Consider using air-purifying plants like snake plant, peace lily, and aloe vera.
• Diet and hydration: Increase intake of antioxidant-rich foods (fruits, vegetables). Stay well-hydrated.

Severe (401-500):

• General population: Avoid all outdoor activities. Work from home if possible. Use N99 masks if absolutely necessary to go outside.
• Sensitive groups: Strictly remain indoors. Keep emergency medication readily available. Consider seeking medical advice for preventive treatment.
• Indoor measures: Operate air purifiers continuously. Seal gaps around doors and windows. Use damp towels under door gaps to prevent infiltration.
• Emergency planning: Have contact information for medical help readily available. Consider temporarily relocating if severe pollution persists and you belong to a sensitive group.

According to research by The Energy and Resources Institute (TERI), properly fitted N95 masks can reduce particulate matter exposure by up to 95%, while staying indoors with closed windows can reduce exposure by 60-90% depending on building sealing and filtration.

Understanding Mask Protection: Which Masks Work for Air Pollution?

Not all masks provide equal protection against air pollution, with specific types offering significantly better filtration of harmful particulate matter.

Mask Type Comparison:

• Cloth Masks: Provide minimal protection (typically less than 30%) against PM2.5 particles. These masks are better than nothing in emergency situations but should not be relied upon for significant pollution protection.
• Surgical Masks: Offer moderate protection (approximately 60-80%) against larger particles but still allow significant leakage of fine PM2.5 particles. Not designed for pollution protection, though better than cloth masks.
• N95/FFP2 Masks: Filter at least 95% of airborne particles when properly fitted. These provide substantial protection and are recommended during poor to severe air quality conditions. Common brands include 3M, Venus, and Honeywell.
• N99/FFP3 Masks: Filter 99% or more of airborne particles, offering the highest level of protection. Recommended during severe pollution episodes, particularly for sensitive groups.

Proper Fitting Techniques:

1. Ensure the mask covers both nose and mouth completely.
2. Press the metal nose clip to create a seal around your nose.
3. Adjust the straps to ensure a tight but comfortable fit.
4. Perform a “seal check” by inhaling sharply. The mask should collapse slightly.

N95 masks can typically be used for 3-5 days depending on pollution levels and humidity conditions. Replace masks when they become damp, visibly dirty, or if breathing becomes difficult. In India, certified N95 masks typically cost between ₹90-250 per piece, while N99 masks range from ₹250-500.

Common mistakes include wearing masks too loosely, leaving gaps, wearing them below the nose, and reusing disposable masks for too long.

For certification, look for “N95” or “N99” markings and certification codes such as IS:9473-2002, NIOSH, or EN 149:2001 which indicate compliance with Indian, American, or European standards respectively.

Air Purifiers: Choosing and Using Effectively

Air purifiers can significantly improve indoor air quality during pollution episodes, but their effectiveness depends on selecting the right technology and using it correctly.

Key Selection Factors:

• CADR (Clean Air Delivery Rate): This indicates how quickly the purifier can clean the air. For most Indian homes, look for CADR ratings of at least 200-300 m³/hour. Larger rooms require higher CADR.
• Room Size Coverage: Match the purifier’s capacity to your room size. A general rule: for rooms up to 250 sq. ft., choose a CADR of 250+ m³/hour. For larger spaces, increase proportionally.
• Filter Types: True HEPA filters capture 99.97% of particles as small as 0.3 microns. Activated carbon filters remove gases, odors, and VOCs. Look for purifiers offering both.
• Additional Features: Real-time air quality monitors, auto mode, filter replacement indicators, and sleep modes add convenience and efficiency.

Cost-Effectiveness Analysis:

• Entry-Level (₹8,000-15,000): Suitable for small rooms (up to 200 sq. ft.). Brands like Mi, Philips, and Honeywell offer decent options in this range. Effective for moderate pollution but may struggle with severe AQI conditions.
• Mid-Range (₹15,000-25,000): Offer better performance for medium-sized rooms (200-350 sq. ft.). Brands like Sharp, Coway, and BlueAir provide good value with higher CADR and better filtration.
• Premium (₹25,000-50,000+): Provide comprehensive coverage for larger spaces with advanced features. Dyson, IQAir, and high-end models from BlueAir and Coway fall in this category. Best for severe pollution conditions.

Replacement filters typically cost ₹2,000-5,000 depending on the brand and need to be changed every 6-12 months based on usage and pollution levels. This ongoing cost should be factored into your purchase decision.

Placement Recommendations:

1. Position the purifier where you spend the most time (bedroom, living room).
2. Place it at least 3 feet away from walls and furniture for optimal air circulation.
3. Keep doors and windows closed in the room with the purifier.
4. Avoid corners or behind obstacles that restrict airflow.

For those on a tight budget, DIY options include creating a “box fan filter” by attaching a MERV-13 filter to a standard box fan, which can provide modest filtration at a much lower cost (approximately ₹1,500-2,000).

Research by IIT Delhi has shown that properly sized air purifiers can reduce indoor PM2.5 levels by 80-90% even when outdoor AQI exceeds 400, but effectiveness decreases significantly without proper room sealing and maintenance.

Decision Framework: When to Take Action Based on AQI

Making informed decisions about daily activities during pollution episodes requires balancing health risks against practical necessities. These frameworks help you make appropriate choices for common scenarios.

School Outdoor Activity Decisions:

• AQI 0-100: All outdoor activities permitted
• AQI 101-200: Limit high-intensity activities; sensitive children should avoid outdoor activities
• AQI 201-300: Move all activities indoors; PE classes should focus on low-intensity exercises
• AQI 301-400: Cancel all outdoor activities; consider shortened school days
• AQI 401-500: Consider school closure or fully online classes

Exercise and Sports Decisions:

• AQI 0-100: All activities permitted, even for sensitive individuals
• AQI 101-200: Reduce intensity and duration; sensitive individuals should exercise indoors
• AQI 201-300: General population should move exercise indoors; reduce intensity by 30-50%
• AQI 301-400: Everyone should exercise only indoors with air purification
• AQI 401-500: Consider skipping intense exercise altogether; limit to gentle stretching indoors

Commuting Choices:

• AQI 0-200: Normal commuting with basic precautions for sensitive groups
• AQI 201-300: Consider carpooling, public transport, or remote work; use N95 masks
• AQI 301-400: Work from home if possible; use N95/N99 masks if commuting necessary
• AQI 401-500: Strongly consider working from home; use N99 masks and minimize travel duration

Special Considerations for Vulnerable Groups:

For Children:

• Reduce outdoor activity thresholds by one category (e.g., take “Poor” precautions during “Moderate” conditions)
• Ensure proper mask fit – adult masks don’t protect children properly
• Create clean air zones in schools and homes with air purification

For Elderly:

• Monitor symptoms closely, as they may appear at lower AQI levels
• Adjust medication regimen in consultation with healthcare providers during high pollution episodes
• Maintain good hydration and indoor humidity (40-60%)

For Essential Outdoor Workers:

• Rotate shifts to minimize continuous exposure
• Take more frequent breaks in clean air environments
• Use higher-grade protection (N99 masks) when AQI exceeds 300
• Consider protective eyewear to reduce eye irritation

Emergency Response Plan for Extreme Pollution (AQI >400):

1. Create a designated “clean room” with an air purifier, sealed windows, and door draft stoppers
2. Keep emergency medication readily available (inhalers, antihistamines)
3. Monitor vulnerable family members for respiratory distress
4. Have contact information for medical services easily accessible
5. Consider temporary relocation if severe conditions persist for more than 48 hours and you have pre-existing conditions

Frequently Asked Questions About AQI and Health

These frequently asked questions address common concerns and misconceptions about air quality, health effects, and protection strategies.

What AQI level is considered safe for children?
Children should ideally be exposed only to AQI levels below 100. At 101-200, outdoor activities should be limited, and above 200, children should remain indoors. Research from AIIMS shows children’s developing lungs are more susceptible to permanent damage from air pollution.

How quickly does air quality affect health?
Health effects can begin within hours of exposure to poor air quality. Sensitive individuals may experience symptoms like coughing, wheezing, or eye irritation within 2-3 hours of exposure to AQI above 150. A study in the Indian Journal of Medical Research found hospital admissions for respiratory issues increased within 24-48 hours following AQI spikes above 300.

Do indoor plants help improve air quality?
Plants provide modest air purification benefits, primarily for gaseous pollutants rather than particulate matter. Research by IIT Bombay shows you would need 10-20 plants per 100 square feet for meaningful impact. Plants like snake plant, peace lily, and areca palm are most effective but should be considered supplementary to air purifiers rather than replacements.

Can air pollution masks be reused?
N95 and N99 masks can typically be reused for 3-5 days in moderate pollution, but should be replaced sooner if they become damp, visibly dirty, or if breathing resistance increases. Never wash N95/N99 masks, as this damages the filtration capacity. Some brands offer reusable masks with replaceable filters, which can be more economical for long-term use.

How accurate are personal air quality monitors?
Consumer-grade monitors typically have an accuracy of ±10-20% compared to reference monitors. They’re useful for relative measurements and trends but may not provide lab-grade precision. Optical particle counters (the most common type in consumer devices) are generally reliable for PM2.5 but less accurate for gas pollutants. Calibrated monitors from brands like Purple Air, Kaiterra, and Airveda offer better accuracy than generic models.

Does rain improve air quality?
Yes, rain effectively washes particulate matter out of the air through a process called “wet deposition.” Studies from IITM Pune show AQI levels typically drop by 30-50% after moderate rainfall (>10mm). However, the improvement is temporary, with pollution levels often rebounding within 24-48 hours after rain stops unless the weather pattern changes significantly.

How long does it take for indoor air to become polluted when outdoor AQI is high?
Without air purification, indoor air quality typically reaches 60-70% of outdoor levels within 3 hours when windows and doors are closed, according to research from TERI. In older buildings with poor sealing, this can occur even faster. Air exchange rates vary significantly based on building construction, ventilation systems, and weather conditions.

How does AQI affect pets?
Pets are also vulnerable to air pollution effects. Dogs and cats can develop respiratory issues similar to humans. Smaller pets with higher respiratory rates (like birds, hamsters) may show symptoms at lower AQI levels. Veterinary research suggests keeping pets indoors when AQI exceeds 150 and limiting outdoor activity for dogs when AQI is above 100.

Resources and Tools for Monitoring Air Quality

These reliable resources and tools can help you stay informed about current air quality conditions and take appropriate protective measures.

Official Government Resources:

• CPCB SAMEER App: The Central Pollution Control Board’s official app provides hourly updates from all government monitoring stations across India. Available for Android and iOS.
• SAFAR (System of Air Quality and Weather Forecasting And Research): Provides current readings and 3-day forecasts for major metropolitan areas. Visit safar.tropmet.res.in
• National Air Quality Index Portal: Web portal with real-time data from all CPCB monitoring stations. Available at app.cpcbccr.com/AQI_India

Reliable Mobile Apps:

• AirVisual: Global coverage with accurate forecasting and health recommendations
• BreezoMeter: Provides street-level air quality data with hourly forecasts
• Plume Air Report: Offers AQI forecasts and personalized health recommendations
• AQI India: Focuses specifically on Indian cities with local monitoring networks

Personal Air Quality Monitors:

• Entry-Level (₹5,000-10,000): Portable devices like Airveda, Temtop, or Kaiterra Laser Egg provide basic real-time monitoring
• Advanced (₹10,000-25,000): Higher-accuracy devices like PurpleAir, Kaiterra Sensedge, or uHoo with multiple pollutant detection

Community-Based Networks:

• PurpleAir Map: Shows readings from community-operated sensors, providing hyperlocal data in many Indian cities
• India Spend Air Quality Network: Independent monitoring network covering areas sometimes missed by government stations

Emergency Notification Services:

• Set up alerts on AQI apps to receive notifications when pollution reaches unhealthy levels
• Follow social media accounts of local environmental agencies for emergency announcements
• Subscribe to SMS alerts from local pollution control boards during winter pollution season

These resources help you make informed decisions about daily activities based on current and forecasted air quality conditions. Combining official government data with community networks provides the most comprehensive picture of local air quality.