Chennai vs Thrissur
Side-by-side air quality comparison between Chennai and Thrissur.
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 | Chennai | Thrissur |
|---|---|---|
| PM2.5(µg/m³) | 13.90 | 8.20 |
| PM10(µg/m³) | 15.30 | 9.70 |
| NO₂(µg/m³) | 15.00 | 10.20 |
| SO₂(µg/m³) | 9.10 | 3.20 |
| O₃(µg/m³) | 56.00 | 26.00 |
| CO(µg/m³) | 316.00 | 146.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Thrissur averaged 57 — a 11-point (19%) gap, with Chennai the more polluted and Thrissur the cleaner of the two. On 851 days when both cities reported, Thrissur was cleaner on 737 of them; the average daily gap was 44 AQI points.
Seasonality & days
Chennai peaks in December, while Thrissur peaks in February. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Thrissur was 0% Severe and 88.4% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Thrissur 52 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Thrissur has improved by 21 AQI points (26.9%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Thrissur hit AQI 181 at Corporation Ground Thrissur (PCB) on 2023-01-09.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Thrissur spans 1 stations with a 0-point spread (min 68, max 68).
Verdict
🏆 Thrissur has better air quality with an AQI of 14 compared to Chennai's 23.