Air quality
Air quality in Kolkata today
Updated
Unhealthy for Sensitive Groups (US AQI 124) People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. Model estimate for Mon, Oct 26, 7:30 am (02:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Kolkata, West Bengal, India, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 124 Unhealthy for Sensitive Groups
- PM2.5
- 42 µg/m³ 2.8× WHO 24-h guideline
- PM10
- 44 µg/m³
- Ozone
- 113 µg/m³
- Dominant pollutant
- PM2.5 sub-index 124
- Best hour today
- 12:30 pm AQI 119
- European AQI
- 56
Air quality in Kolkata right now
Right now the modelled US Air Quality Index for Kolkata, West Bengal, India is 124, which falls in the "Unhealthy for Sensitive Groups" band (up to 150). People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors.
The index is driven mainly by PM2.5, whose own sub-index is 124. Fine and coarse particles come from traffic, heating, industry, dust and smoke; they build up on calm nights and clear when wind or rain arrives.
PM2.5 is 42 µg/m³, 2.8 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 44 µg/m³ against a guideline of 45; ozone is 113 µg/m³ (above the WHO 8-hour level of 100); nitrogen dioxide is 13 µg/m³ (below the 24-hour guideline of 25).
Also this hour: UV index 1.5, carbon monoxide 667 µg/m³.
Kolkata AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 117 around Mon 10:30 pm to 191 around Mon 5:30 pm, from "Unhealthy for Sensitive Groups" at best to "Unhealthy" at worst.
The following day is expected to be cleaner, averaging about 131 against 140 for the next 24 hours.
| Local time (Asia/Kolkata) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 7:30 am | 124 | Unhealthy for Sensitive Groups | 42.3 | 44 | 113 |
| Mon 10:30 am | 120 | Unhealthy for Sensitive Groups | 32.5 | 34 | 195 |
| Mon 1:30 pm | 125 | Unhealthy for Sensitive Groups | 30.3 | 32 | 222 |
| Mon 4:30 pm | 186 | Unhealthy | 36.6 | 38 | 163 |
| Mon 7:30 pm | 174 | Unhealthy | 53.3 | 54 | 100 |
| Mon 10:30 pm | 117 | Unhealthy for Sensitive Groups | 82.2 | 83 | 63 |
| Tue 1:30 am | 127 | Unhealthy for Sensitive Groups | 75.4 | 76 | 55 |
| Tue 4:30 am | 134 | Unhealthy for Sensitive Groups | 50.3 | 51 | 51 |
| Tue 7:30 am | 136 | Unhealthy for Sensitive Groups | 42.7 | 43 | 109 |
| Tue 10:30 am | 137 | Unhealthy for Sensitive Groups | 39.7 | 41 | 190 |
| Tue 1:30 pm | 138 | Unhealthy for Sensitive Groups | 25.7 | 26 | 187 |
| Tue 4:30 pm | 161 | Unhealthy | 32.5 | 33 | 119 |
| Tue 7:30 pm | 134 | Unhealthy for Sensitive Groups | 38.2 | 38 | 74 |
| Tue 10:30 pm | 128 | Unhealthy for Sensitive Groups | 42.8 | 43 | 59 |
| Wed 1:30 am | 115 | Unhealthy for Sensitive Groups | 46 | 46 | 58 |
| Wed 4:30 am | 110 | Unhealthy for Sensitive Groups | 49.4 | 50 | 37 |
| Wed 7:30 am | 112 | Unhealthy for Sensitive Groups | 57.3 | 58 | 109 |
Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.
Best time to be outside in Kolkata today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 12:30 pm (AQI 119, Unhealthy for Sensitive Groups) and the worst around 5:30 pm (AQI 191). That is a swing of 72 points, so a run or walk around 12:30 pm is noticeably better.
Kolkata vs the rest of India
Across 245 India cities we track, the average US AQI right now is 116 (Unhealthy for Sensitive Groups). Kolkata at 124 is 8 points worse than average.
It ranks 195 of 245 from cleanest to most polluted; the cleanest is Dindigul (28) and the most polluted Karnāl (447).
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Kolkata
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Howrah | 5 km | 153 | Unhealthy | 63.1 |
| Bāli | 10 km | 150 | Unhealthy for Sensitive Groups | 58.6 |
| Dam Dam | 10 km | 150 | Unhealthy for Sensitive Groups | 58.6 |
| Kāmārhāti | 12 km | 150 | Unhealthy for Sensitive Groups | 58.6 |
| Maheshtala | 13 km | 153 | Unhealthy | 63.1 |
| Pānihāti | 14 km | 150 | Unhealthy for Sensitive Groups | 58.6 |
| Rajpur Sonarpur | 16 km | 153 | Unhealthy | 63.1 |
| Madhyamgram | 16 km | 150 | Unhealthy for Sensitive Groups | 58.6 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Kolkata, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.
Wildfire smoke
PM2.5 is forecast to reach 85 µg/m³ in the next 24 hours while NASA satellites detected 204 fire hotspots within 300 km in the last day (nearest about 38 km away). Smoke is a likely contributor: keep windows closed, run an air purifier or HVAC filter, and check the fire map before heading out.
Advice for sensitive groups
At 124, children, older adults, pregnant people and anyone with asthma, COPD or heart disease should limit time outdoors, especially strenuous activity. A well-fitted N95/FFP2 mask cuts particle exposure; it does not filter ozone.
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.
Nearby cities
More for Kolkata
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.