Chennai vs Tiruchirappalli
Side-by-side air quality comparison between Chennai and Tiruchirappalli.
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 Tiruchirappalli averaged 50 — a 18-point (36%) gap, with Chennai the more polluted and Tiruchirappalli the cleaner of the two. On 82 days when both cities reported, Tiruchirappalli was cleaner on 78 of them; the average daily gap was 57 AQI points.
Seasonality & days
Chennai peaks in December, while Tiruchirappalli peaks in January. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Tiruchirappalli was 0% Severe and 96.5% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Tiruchirappalli 46 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Tiruchirappalli has improved by 23 AQI points (31.5%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Tiruchirappalli hit AQI 114 at St Joseph College (TNPCB) on 2024-01-14.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Tiruchirappalli spans 1 stations with a 0-point spread (min 52, max 52).