Asansol vs Chennai
Side-by-side air quality comparison between Asansol and Chennai.
Live AQI from Open-Meteo CAMS (~45 km global model, updated hourly). Multi-year history from CPCB station data via aqinow.co pipeline (2016–2024, station-level daily records).
AQI Comparison
Pollutant-level comparison (PM2.5, PM10, O3, NO2, SO2, CO)▾
| Pollutant | Asansol | Chennai |
|---|---|---|
| PM2.5(µg/m³) | 89.60 | 16.60 |
| PM10(µg/m³) | 95.50 | 18.20 |
| NO₂(µg/m³) | 48.70 | 16.20 |
| SO₂(µg/m³) | 82.10 | 9.00 |
| O₃(µg/m³) | 39.00 | 57.00 |
| CO(µg/m³) | 708.00 | 350.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Asansol averaged an AQI of 145 while Chennai averaged 68 — a 77-point (113%) gap, with Asansol the more polluted and Chennai the cleaner of the two. On 1982 days when both cities reported, Chennai was cleaner on 1114 of them; the average daily gap was 70 AQI points.
Seasonality & days
Both cities see their worst air in December on average. Asansol logged 0% Severe days and 43.3% Good-or-Satisfactory days; Chennai was 0% Severe and 57.5% Good-or-Satisfactory. Longest clean-air streaks: Asansol 44 days, Chennai 53 days.
Year-over-year progress
Asansol has worsened by 12 AQI points (9%) from 2018 to 2024; Chennai has improved by 25 AQI points (26.9%) over the same window. The worst recorded day for Asansol reached AQI 394 at Court Area (WBPCB) on 2022-12-13; Chennai hit AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14.
Station-level disparity
Asansol spans 4 CPCB stations with a 40-point spread (min 123, max 163); Chennai spans 9 stations with a 27-point spread (min 63, max 90).
Verdict
🏆 Chennai has better air quality with an AQI of 28 compared to Asansol's 199. That's a significant difference of 171 points.