A good AQI level is between 0 and 50, indicating air quality that poses little or no risk to health.
AQI in Siwan Today (Friday, February 06) - Air Quality in Siwan
As of Today, Siwan AQI level is 72 which is recorded as Moderate category. This level is 6 point(s) higher compared to the previous day. The AQI , a standard measure of air quality, offers insights into the concentration of pollutants in the air, ranging from harmful particles to gases like carbon monoxide and sulfur dioxide.
Siwan's AQI
Siwan WeatherFriday Feb 06
Last 7 Days AQI
| Dates | City, States | AQI |
|---|---|---|
| February 06, 2026 | Siwan, Bihar | 72 |
| February 05, 2026 | Siwan, Bihar | 66 |
| February 04, 2026 | Siwan, Bihar | 80 |
| February 03, 2026 | Siwan, Bihar | 82 |
| February 02, 2026 | Siwan, Bihar | 83 |
| February 01, 2026 | Siwan, Bihar | 84 |
| January 31, 2026 | Siwan, Bihar | 62 |
Changes in AQI in Last 7 Days
Most Polluted City/States in India
| Rank | City, States | AQI |
|---|---|---|
| 1 | Ballabgarh, Haryana | 302 |
| 2 | Gurugram, Haryana | 295 |
| 3 | Dharuhera, Haryana | 290 |
| 4 | Charkhi Dadri, Haryana | 279 |
| 5 | Cuttack, Odisha | 279 |
| 6 | Ghaziabad, Uttar Pradesh | 266 |
| 7 | Guwahati, Assam | 248 |
| 8 | Delhi, Delhi | 241 |
| 9 | Noida, Uttar Pradesh | 237 |
| 10 | Bhiwadi, Rajasthan | 228 |
Least Polluted City/States in India
| Rank | City, States | AQI |
|---|---|---|
| 1 | Shillong, Meghalaya | 26 |
| 2 | Madikeri, Karnataka | 32 |
| 3 | Nagapattinam, TamilNadu | 41 |
| 4 | Perundurai, TamilNadu | 43 |
| 5 | Puducherry, Puducherry | 43 |
| 6 | Kishanganj, Bihar | 45 |
| 7 | Pudukottai, TamilNadu | 45 |
| 8 | Bagalkot, Karnataka | 46 |
AQI in all cities of India
Frequently Asked Questions
Which AQI is best?
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).
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



















