Air quality
Air quality in Coimbatore today
Updated
Good (US AQI 40) Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. Model estimate for Sun, Oct 25, 11:30 pm (18:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Coimbatore, Tamil Nadu, India, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 40 Good
- PM2.5
- 12 µg/m³ 0.8× WHO 24-h guideline
- PM10
- 12 µg/m³
- Ozone
- 29 µg/m³
- Dominant pollutant
- PM2.5 sub-index 40
- Best hour today
- 6:30 am AQI 43
- European AQI
- 33
Air quality in Coimbatore right now
Right now the modelled US Air Quality Index for Coimbatore, Tamil Nadu, India is 40, which falls in the "Good" band (up to 50). Air quality is satisfactory and poses little or no risk; a good time for outdoor activity.
The index is driven mainly by PM2.5, whose own sub-index is 40. 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 12 µg/m³, within the WHO 24-hour guideline of 15 µg/m³; PM10 is 12 µg/m³ against a guideline of 45; ozone is 29 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 18 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 732 µg/m³.
Coimbatore AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 40 around Sun 11:30 pm to 76 around Mon 11:30 pm, from "Good" at best to "Moderate" at worst.
The following day is expected to be worse, averaging about 99 against 54 for the next 24 hours.
| Local time (Asia/Kolkata) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Sun 11:30 pm | 40 | Good | 11.5 | 12 | 29 |
| Mon 2:30 am | 40 | Good | 10 | 10 | 35 |
| Mon 5:30 am | 41 | Good | 13 | 14 | 33 |
| Mon 8:30 am | 47 | Good | 17.8 | 19 | 69 |
| Mon 11:30 am | 53 | Moderate | 28.2 | 32 | 134 |
| Mon 2:30 pm | 59 | Moderate | 28 | 31 | 132 |
| Mon 5:30 pm | 75 | Moderate | 29.8 | 32 | 93 |
| Mon 8:30 pm | 70 | Moderate | 36.7 | 38 | 75 |
| Mon 11:30 pm | 76 | Moderate | 37.5 | 39 | 58 |
| Tue 2:30 am | 83 | Moderate | 43.9 | 46 | 44 |
| Tue 5:30 am | 91 | Moderate | 46.4 | 49 | 47 |
| Tue 8:30 am | 99 | Moderate | 44.8 | 48 | 111 |
| Tue 11:30 am | 104 | Unhealthy for Sensitive Groups | 36.1 | 39 | 161 |
| Tue 2:30 pm | 107 | Unhealthy for Sensitive Groups | 34.6 | 37 | 155 |
| Tue 5:30 pm | 119 | Unhealthy for Sensitive Groups | 32.9 | 34 | 105 |
| Tue 8:30 pm | 108 | Unhealthy for Sensitive Groups | 30.6 | 31 | 68 |
| Tue 11:30 pm | 106 | Unhealthy for Sensitive Groups | 29.8 | 31 | 64 |
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 Coimbatore today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 6:30 am (AQI 43, Good) and the worst around 5:30 pm (AQI 75). That is a swing of 32 points, so a run or walk around 6:30 am is noticeably better.
Coimbatore vs the rest of India
Across 260 India cities we track, the average US AQI right now is 116 (Unhealthy for Sensitive Groups). Coimbatore at 40 is 76 points cleaner than average.
It ranks 10 of 260 from cleanest to most polluted; the cleanest is Dindigul (26) and the most polluted Karnāl (346).
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Coimbatore
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Kurichchi | 5 km | 40 | Good | 11.5 |
| Tiruppur | 44 km | 51 | Moderate | 16.2 |
| Wellington, Tamil Nadu | 45 km | 40 | Good | 11.5 |
| Erode | 91 km | 38 | Good | 11.2 |
| Thrissur | 98 km | 44 | Good | 15.4 |
| Dindigul | 131 km | 26 | Good | 4.8 |
| Kozhikode | 132 km | 45 | Good | 9.9 |
| Kanayannur | 139 km | 43 | Good | 20.3 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Coimbatore, 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.
Advice for sensitive groups
With the AQI at 40, there is no need for sensitive groups to change plans. People with asthma should still carry their reliever inhaler as usual.
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 Coimbatore
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).