Air quality
Air quality in Ambattur today
Updated
Moderate (US AQI 75) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 6:30 am (01:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Ambattur, Tamil Nadu, India, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 75 Moderate
- PM2.5
- 34 µg/m³ 2.3× WHO 24-h guideline
- PM10
- 37 µg/m³
- Ozone
- 72 µg/m³
- Dominant pollutant
- PM2.5 sub-index 75
- Best hour today
- 6:30 am AQI 75
- European AQI
- 51
Air quality in Ambattur right now
Right now the modelled US Air Quality Index for Ambattur, Tamil Nadu, India is 75, which falls in the "Moderate" band (up to 100). Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.
The index is driven mainly by PM2.5, whose own sub-index is 75. 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 34 µg/m³, 2.3 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 37 µg/m³ against a guideline of 45; ozone is 72 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 9.1 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 441 µg/m³.
Ambattur AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 75 around Mon 6:30 am to 144 around Tue 6:30 am, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.
The following day is expected to be worse, averaging about 131 against 111 for the next 24 hours.
| Local time (Asia/Kolkata) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 6:30 am | 75 | Moderate | 34.1 | 37 | 72 |
| Mon 9:30 am | 81 | Moderate | 41.6 | 46 | 123 |
| Mon 12:30 pm | 88 | Moderate | 52.4 | 59 | 173 |
| Mon 3:30 pm | 108 | Unhealthy for Sensitive Groups | 51.6 | 58 | 159 |
| Mon 6:30 pm | 137 | Unhealthy for Sensitive Groups | 56.1 | 61 | 132 |
| Mon 9:30 pm | 115 | Unhealthy for Sensitive Groups | 61.9 | 67 | 122 |
| Tue 12:30 am | 125 | Unhealthy for Sensitive Groups | 61 | 66 | 111 |
| Tue 3:30 am | 135 | Unhealthy for Sensitive Groups | 59.4 | 63 | 99 |
| Tue 6:30 am | 144 | Unhealthy for Sensitive Groups | 55.6 | 58 | 93 |
| Tue 9:30 am | 150 | Unhealthy for Sensitive Groups | 45.8 | 48 | 124 |
| Tue 12:30 pm | 148 | Unhealthy for Sensitive Groups | 29.6 | 31 | 160 |
| Tue 3:30 pm | 140 | Unhealthy for Sensitive Groups | 23.5 | 25 | 123 |
| Tue 6:30 pm | 132 | Unhealthy for Sensitive Groups | 41 | 42 | 54 |
| Tue 9:30 pm | 126 | Unhealthy for Sensitive Groups | 34.7 | 35 | 46 |
| Wed 12:30 am | 117 | Unhealthy for Sensitive Groups | 27.5 | 28 | 55 |
| Wed 3:30 am | 106 | Unhealthy for Sensitive Groups | 23.1 | 24 | 52 |
| Wed 6:30 am | 96 | Moderate | 23.9 | 24 | 56 |
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 Ambattur today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 6:30 am (AQI 75, Moderate) and the worst around 6:30 pm (AQI 137). That is a swing of 62 points, so a run or walk around 6:30 am is noticeably better.
Ambattur vs the rest of India
Across 260 India cities we track, the average US AQI right now is 116 (Unhealthy for Sensitive Groups). Ambattur at 75 is 41 points cleaner than average.
It ranks 87 of 260 from cleanest to most polluted; the cleanest is Dindigul (27) and the most polluted Karnāl (451).
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Ambattur
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Avadi | 6 km | 86 | Moderate | 45.3 |
| Chennai | 13 km | 89 | Moderate | 49.9 |
| Pallāvaram | 15 km | 89 | Moderate | 49.9 |
| Tambaram | 20 km | 89 | Moderate | 49.9 |
| Rānipet | 92 km | 72 | Moderate | 39.9 |
| Tirupati | 100 km | 80 | Moderate | 34.5 |
| Vellore | 113 km | 72 | Moderate | 39.9 |
| Puducherry | 134 km | 34 | Good | 19.3 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Ambattur, 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 63 µg/m³ in the next 24 hours while NASA satellites detected 1 fire hotspot within 300 km in the last day (nearest about 244 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 75, most people are fine outdoors. If you are unusually sensitive to PM2.5, keep long or intense workouts to the cleaner hours shown above.
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 Ambattur
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.