A good AQI level is between 0 and 50, indicating air quality that poses little or no risk to health.
Explorer
What is Air Quality Index (AQI)?
The air quality in any city is determined by the Air Quality Index (AQI). This indicator is developed by government agencies. To assess a city's AQI, various pollutants are considered. During the evaluation, the concentration of these pollutants in the air is measured. The AQI levels help inform people about whether air pollution is increasing or decreasing. Additionally, it is explained how air pollution can be harmful to people's health and in what ways. When the AQI rises, people are advised to take precautions, such as wearing masks outdoors and using air purifiers indoors.
Most Polluted City/States in India
Updated: August 09, 2025| Rank | City, States | AQI |
|---|---|---|
| 1 | Sri Ganganagar, Rajasthan | 248 |
| 2 | Greater Noida, Uttar Pradesh | 182 |
| 3 | Bulandshahr, Uttar Pradesh | 155 |
| 4 | Byrnihat, Assam | 137 |
| 5 | Ghaziabad, Uttar Pradesh | 126 |
| 6 | Purnia, Bihar | 126 |
| 7 | Samastipur, Bihar | 124 |
| 8 | Coimbatore, TamilNadu | 116 |
| 9 | Baran, Rajasthan | 114 |
| 10 | Saharsa, Bihar | 114 |
Source : Central Pollution Control Board
More Cities
Frequently Asked Questions
What is a good AQI level?
What is the safe range of AQI?
The safe range of AQI is from 0 to 100, covering the categories of "Good" (0-50) and "Moderate" (51-100).
What are the criteria for AQI?
AQI criteria include measuring the concentration of pollutants like PM2.5, PM10, ozone, nitrogen dioxide, sulphur dioxide, carbon monoxide, and ammonia over a specified averaging period.
What are the 8 parameters of AQI?
The 8 parameters of AQI are: Particulate Matter (PM10), Particulate Matter (PM2.5), Ozone (O3), Nitrogen Dioxide (NO2), Sulphur Dioxide (SO2), Carbon Monoxide (CO), Ammonia (NH3), and Lead (Pb).
How is AQI calculated?
AQI is calculated using pollutant concentration data, which is converted into an AQI value for each pollutant through specific formulae. The highest value among these is reported as the overall AQI for the location.
What are the 6 categories of AQI?
The 6 categories of AQI are: 0-50: Good 51-100: Moderate 101-200: Poor 201-300: Unhealthy 301-400: Severe 401-500+: Hazardous
Cities
Cloudburst Hits Kullu, As Rain Continues To Batter Himachal. IMD Issues Yellow Alert For Today
Cities
Heavy Rain Alert In Lucknow: Schools Up To Class 8 Shut For Today
Cities
Monsoon Intensifies In Uttar Pradesh, Heavy Rain Alert For Several Districts
Cities
Kinnaur Kailash Yatra Suspended, 413 Pilgrims Rescued After Rain Ravages Route
Advertisement
Top Headlines
India
Six Pakistani Aircraft Shot Down During Op Sindoor, Army Chief Makes Big Revelation
Business
Trump’s Tariff Strategy On India May Backfire, Says Former NSA John Bolton
India
2 Soldiers Killed During Gunfight With Terrorists In J&K's Kulgam As Op Akhal Enters 9th Day
India
'We Told The World What We Achieved': IAF Chief Says 'Ghost' Of Balakot Laid To Rest With Op Sindoor
Advertisement
Advertisement
See Today's Weather
powered by
Advertisement
