Coimbatore vs Kalyān
Side-by-side air quality comparison between Coimbatore and Kalyān.
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 | Kalyān |
|---|---|---|
| PM2.5(µg/m³) | 2.10 | 24.30 |
| PM10(µg/m³) | 2.50 | 50.80 |
| NO₂(µg/m³) | 1.50 | 5.00 |
| SO₂(µg/m³) | 1.20 | 16.90 |
| O₃(µg/m³) | 68.00 | 106.00 |
| CO(µg/m³) | 135.00 | 150.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Coimbatore averaged an AQI of 66 while Kalyān averaged 95 — a 29-point (44%) gap, with Kalyān the more polluted and Coimbatore the cleaner of the two. On 885 days when both cities reported, Coimbatore was cleaner on 701 of them; the average daily gap was 63 AQI points.
Seasonality & days
Coimbatore peaks in November, while Kalyān peaks in January. Coimbatore logged 0% Severe days and 90.5% Good-or-Satisfactory days; Kalyān was 0.1% Severe and 46.4% Good-or-Satisfactory. Longest clean-air streaks: Coimbatore 32 days, Kalyān 78 days.
Year-over-year progress
Coimbatore has improved by 5 AQI points (7%) from 2019 to 2024; Kalyān has improved by 4 AQI points (4%) over the same window. The worst recorded day for Coimbatore reached AQI 279 at SIDCO Kurichi (TNPCB) on 2024-09-28; Kalyān hit AQI 414 at Khadakpada (MPCB) on 2022-01-24.
Station-level disparity
Coimbatore spans 2 CPCB stations with a 1-point spread (min 63, max 64); Kalyān spans 2 stations with a 18-point spread (min 98, max 116).
Verdict
🏆 Coimbatore has better air quality with an AQI of 4 compared to Kalyān's 52.