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Air Quality Index

Air Quality Index

Air Quality Index (AQI) is a tool to showcase air quality status. It transforms complex air quality data of various pollutants into a single number and colour.
AQI has six categories of air quality. These are: Good, Satisfactory, Moderately Polluted, Poor, Very Poor and Severe. Each of these categories is decided based on ambient concentration values of air pollutants and their likely health impacts. As the AQI increases, an increasingly large percentage of the population is likely to experience health effects.

Delhi
Bengaluru
Mumbai
Chennai
Hyderabad
Pune
Ahmedabad
Aurangabad
Jaipur
Lucknow
Ludhiana
Muzaffarpur
Nashik
Patna
Rajamahendravaram
Solapur
Thiruvananthapuram
Tirupati
Ujjain
Varanasi
Visakhapatnam


The measurement of air quality is based on eight pollutants, namely

  • Particulate Matter (size less than 10 µm) or (PM10)
  • Particulate Matter (size less than 2.5 µm) or (PM2.5)
  • Nitrogen Dioxide (NO2)
  • Sulphur Dioxide (SO2)
  • Carbon Monoxide (CO)
  • Ozone (O3)
  • Ammonia (NH3)
  • Lead (Pb)

The AQI values and their associated health impacts are as follows:

Remark AQI Possible Health Impacts
Good 0-50 Minimal impact
Satisfactory 51-100 Minor breathing discomfort to sensitive people
Moderate 101-200 Breathing discomfort to the people with lungs, asthma and heart diseases
Poor 201-300 Breathing discomfort to most people on prolonged exposure
Very Poor 301-400 Respiratory illness on prolonged exposure
Severe 401-500 Affects healthy people and seriously impacts those with existing diseases
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