Chennai vs Coimbatore
Side-by-side air quality comparison between Chennai and Coimbatore.
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
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Coimbatore averaged 66 — a 2-point (3%) gap, with Chennai the more polluted and Coimbatore the cleaner of the two. On 1004 days when both cities reported, Coimbatore was cleaner on 838 of them; the average daily gap was 45 AQI points.
Seasonality & days
Chennai peaks in December, while Coimbatore peaks in November. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Coimbatore was 0% Severe and 90.5% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Coimbatore 32 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Coimbatore has improved by 5 AQI points (7%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Coimbatore hit AQI 279 at SIDCO Kurichi (TNPCB) on 2024-09-28.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Coimbatore spans 2 stations with a 1-point spread (min 63, max 64).