Coimbatore vs Kollam
Side-by-side air quality comparison between Coimbatore and Kollam.
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 | Coimbatore | Kollam |
|---|---|---|
| PM2.5(µg/m³) | 2.70 | 5.50 |
| PM10(µg/m³) | 2.90 | 7.90 |
| NO₂(µg/m³) | 4.50 | 3.80 |
| SO₂(µg/m³) | 2.20 | 1.60 |
| O₃(µg/m³) | 43.00 | 33.00 |
| CO(µg/m³) | 159.00 | 96.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Coimbatore averaged an AQI of 66 while Kollam averaged 84 — a 18-point (27%) gap, with Kollam the more polluted and Coimbatore the cleaner of the two. On 646 days when both cities reported, Coimbatore was cleaner on 466 of them; the average daily gap was 30 AQI points.
Seasonality & days
Coimbatore peaks in November, while Kollam peaks in January. Coimbatore logged 0% Severe days and 90.5% Good-or-Satisfactory days; Kollam was 0% Severe and 81% Good-or-Satisfactory. Longest clean-air streaks: Coimbatore 32 days, Kollam 65 days.
Year-over-year progress
Coimbatore has improved by 5 AQI points (7%) from 2019 to 2024; Kollam has improved by 2 AQI points (2.3%) over the same window. The worst recorded day for Coimbatore reached AQI 279 at SIDCO Kurichi (TNPCB) on 2024-09-28; Kollam hit AQI 272 at Polayathode Kollam (PCB) on 2024-04-06.
Station-level disparity
Coimbatore spans 2 CPCB stations with a 1-point spread (min 63, max 64); Kollam spans 1 stations with a 0-point spread (min 84, max 84).
Verdict
🏆 Coimbatore has better air quality with an AQI of 5 compared to Kollam's 9.