Coimbatore vs Howrah
Side-by-side air quality comparison between Coimbatore and Howrah.
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 | Howrah |
|---|---|---|
| PM2.5(µg/m³) | 2.70 | 64.70 |
| PM10(µg/m³) | 2.90 | 69.40 |
| NO₂(µg/m³) | 4.50 | 18.10 |
| SO₂(µg/m³) | 2.20 | 13.10 |
| O₃(µg/m³) | 43.00 | 86.00 |
| CO(µg/m³) | 159.00 | 421.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Coimbatore averaged an AQI of 66 while Howrah averaged 126 — a 60-point (91%) gap, with Howrah the more polluted and Coimbatore the cleaner of the two. On 1005 days when both cities reported, Coimbatore was cleaner on 858 of them; the average daily gap was 106 AQI points.
Seasonality & days
Coimbatore peaks in November, while Howrah peaks in December. Coimbatore logged 0% Severe days and 90.5% Good-or-Satisfactory days; Howrah was 0.7% Severe and 48.7% Good-or-Satisfactory. Longest clean-air streaks: Coimbatore 32 days, Howrah 120 days.
Year-over-year progress
Coimbatore has improved by 5 AQI points (7%) from 2019 to 2024; Howrah has improved by 32 AQI points (20.3%) over the same window. The worst recorded day for Coimbatore reached AQI 279 at SIDCO Kurichi (TNPCB) on 2024-09-28; Howrah hit AQI 500 at Ghusuri (WBPCB) on 2017-04-15.
Station-level disparity
Coimbatore spans 2 CPCB stations with a 1-point spread (min 63, max 64); Howrah spans 5 stations with a 116-point spread (min 111, max 227).
Verdict
🏆 Coimbatore has better air quality with an AQI of 5 compared to Howrah's 117. That's a significant difference of 112 points.