Air quality
Air quality in Tiruvottiyūr today
Updated
Moderate (US AQI 88) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 7:30 am (02:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Tiruvottiyūr, Tamil Nadu, India, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 88 Moderate
- PM2.5
- 45 µg/m³ 3× WHO 24-h guideline
- PM10
- 54 µg/m³
- Ozone
- 150 µg/m³
- Dominant pollutant
- ozone sub-index 88
- Best hour today
- 7:30 am AQI 88
- European AQI
- 75
Air quality in Tiruvottiyūr right now
Right now the modelled US Air Quality Index for Tiruvottiyūr, Tamil Nadu, India is 88, 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 ozone, whose own sub-index is 88. Ozone usually peaks in the afternoon on sunny days and falls back after sunset.
PM2.5 is 45 µg/m³, 3 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 54 µg/m³ against a guideline of 45; ozone is 150 µg/m³ (above the WHO 8-hour level of 100); nitrogen dioxide is 4.1 µg/m³ (below the 24-hour guideline of 25).
Also this hour: UV index 0.7, carbon monoxide 335 µg/m³.
Tiruvottiyūr AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 88 around Mon 7:30 am to 157 around Tue 2:30 am, from "Moderate" at best to "Unhealthy" at worst.
The following day is expected to be cleaner, averaging about 122 against 137 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 | 88 | Moderate | 44.6 | 54 | 150 |
| Mon 10:30 am | 110 | Unhealthy for Sensitive Groups | 52.9 | 63 | 166 |
| Mon 1:30 pm | 133 | Unhealthy for Sensitive Groups | 51.3 | 61 | 165 |
| Mon 4:30 pm | 145 | Unhealthy for Sensitive Groups | 47.6 | 57 | 159 |
| Mon 7:30 pm | 145 | Unhealthy for Sensitive Groups | 51.9 | 60 | 171 |
| Mon 10:30 pm | 149 | Unhealthy for Sensitive Groups | 50.5 | 57 | 175 |
| Tue 1:30 am | 155 | Unhealthy | 47.8 | 53 | 169 |
| Tue 4:30 am | 154 | Unhealthy | 54.4 | 59 | 145 |
| Tue 7:30 am | 138 | Unhealthy for Sensitive Groups | 55.9 | 59 | 131 |
| Tue 10:30 am | 139 | Unhealthy for Sensitive Groups | 39.3 | 42 | 155 |
| Tue 1:30 pm | 134 | Unhealthy for Sensitive Groups | 27.5 | 29 | 170 |
| Tue 4:30 pm | 133 | Unhealthy for Sensitive Groups | 24 | 25 | 133 |
| Tue 7:30 pm | 120 | Unhealthy for Sensitive Groups | 35.4 | 36 | 69 |
| Tue 10:30 pm | 114 | Unhealthy for Sensitive Groups | 33.6 | 35 | 51 |
| Wed 1:30 am | 109 | Unhealthy for Sensitive Groups | 27.6 | 28 | 64 |
| Wed 4:30 am | 102 | Unhealthy for Sensitive Groups | 23.6 | 24 | 63 |
| Wed 7:30 am | 94 | Moderate | 27.2 | 28 | 69 |
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 Tiruvottiyūr today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 7:30 am (AQI 88, Moderate) and the worst around 9:30 pm (AQI 146). That is a swing of 58 points, so a run or walk around 7:30 am is noticeably better.
Tiruvottiyūr vs the rest of India
Across 245 India cities we track, the average US AQI right now is 116 (Unhealthy for Sensitive Groups). Tiruvottiyūr at 88 is 28 points cleaner than average.
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Tiruvottiyūr
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Chennai | 8 km | 92 | Moderate | 51.8 |
| Ambattur | 17 km | 92 | Moderate | 51.8 |
| Avadi | 21 km | 89 | Moderate | 49.7 |
| Pallāvaram | 27 km | 92 | Moderate | 51.8 |
| Tambaram | 32 km | 92 | Moderate | 51.8 |
| Rānipet | 108 km | 74 | Moderate | 42.3 |
| Tirupati | 109 km | 82 | Moderate | 35.5 |
| Vellore | 129 km | 74 | Moderate | 42.3 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Tiruvottiyūr, 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 56 µg/m³ in the next 24 hours while NASA satellites detected 1 fire hotspot within 300 km in the last day (nearest about 251 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 88, most people are fine outdoors. If you are unusually sensitive to ozone, 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 Tiruvottiyūr
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.