Coimbatore vs Katihar
Side-by-side air quality comparison between Coimbatore and Katihar.
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 | Katihar |
|---|---|---|
| PM2.5(µg/m³) | 2.50 | 109.20 |
| PM10(µg/m³) | 3.00 | 114.30 |
| NO₂(µg/m³) | 4.60 | 31.10 |
| SO₂(µg/m³) | 2.00 | 18.30 |
| O₃(µg/m³) | 40.00 | 43.00 |
| CO(µg/m³) | 163.00 | 770.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Coimbatore averaged an AQI of 66 while Katihar averaged 123 — a 57-point (86%) gap, with Katihar the more polluted and Coimbatore the cleaner of the two. On 493 days when both cities reported, Coimbatore was cleaner on 444 of them; the average daily gap was 115 AQI points.
Seasonality & days
Coimbatore peaks in November, while Katihar peaks in December. Coimbatore logged 0% Severe days and 90.5% Good-or-Satisfactory days; Katihar was 3.1% Severe and 26.9% Good-or-Satisfactory. Longest clean-air streaks: Coimbatore 32 days, Katihar 19 days.
Year-over-year progress
Coimbatore has improved by 5 AQI points (7%) from 2019 to 2024; Katihar has improved by 188 AQI points (60.5%) over the same window. The worst recorded day for Coimbatore reached AQI 279 at SIDCO Kurichi (TNPCB) on 2024-09-28; Katihar hit AQI 465 at Mirchaibari (BSPCB) on 2023-01-23.
Station-level disparity
Coimbatore spans 2 CPCB stations with a 1-point spread (min 63, max 64); Katihar spans 1 stations with a 0-point spread (min 185, max 185).
Verdict
🏆 Coimbatore has better air quality with an AQI of 4 compared to Katihar's 264. That's a significant difference of 260 points.