---
station_id: cpcb-288
raw_id: 288
name: "Velachery Res. Area"
city: "Chennai"
state: ""
country: India
provider: cpcb
provider_name: "Central Pollution Control Board, Government of India"
lat: 13.0052189
lon: 80.2398125
aqi: 91
band: satisfactory
yll_years: 3.11
updated: 2026-11-12T15:05:11.110Z
updated_local: "12 Nov 2026, 20:35 IST"
source: https://oaq.notf.in
mirror: https://mugilu.live/s/cpcb/288
---

# Velachery Res. Area: Air Quality

Current AQI: **91 (Satisfactory)** as of 12 Nov 2026, 20:35 IST.

Located in Chennai, India. Source: **Central Pollution Control Board, Government of India** via OAQ.

## Pollutants

| Pollutant | Value | Unit |
|---|---|---|
| PM2.5 | 36.75 | µg/m³ |
| PM10 | 74.79 | µg/m³ |
| SO₂ | 9.24 | µg/m³ |
| O₃ | 6.44 | µg/m³ |
| CO | 1.84 | mg/m³ |

## Estimated health impact (AQLI)

If this PM2.5 level (36.75 µg/m³) persisted as the annual average, the Air Quality Life Index estimates **3.11 years** of life expectancy lost vs. the WHO 5 µg/m³ guideline.

Formula: `max(0, PM2.5 − 5) × 0.098 years`. From Ebenstein et al. 2017 PNAS and Greenstone & Fan 2018 (U Chicago EPIC, [aqli.epic.uchicago.edu](https://aqli.epic.uchicago.edu)). This is a long-term exposure model applied to a live snapshot. Treat as an order-of-magnitude indication.

## Location

- Coordinates: 13.0052° N, 80.2398° E

## Source

Data from Central Pollution Control Board, Government of India via OAQ Data Broker (https://oaq.notf.in). Mirrored hourly. Licensed CC BY 4.0.

Part of an open-source mirror. See https://mugilu.live/about.