Kalyān vs Katihar
Side-by-side air quality comparison between Kalyān 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 | Kalyān | Katihar |
|---|---|---|
| PM2.5(µg/m³) | 22.10 | 109.20 |
| PM10(µg/m³) | 40.40 | 114.30 |
| NO₂(µg/m³) | 23.10 | 31.10 |
| SO₂(µg/m³) | 21.70 | 18.30 |
| O₃(µg/m³) | 19.00 | 43.00 |
| CO(µg/m³) | 174.00 | 770.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kalyān averaged an AQI of 95 while Katihar averaged 123 — a 28-point (29%) gap, with Katihar the more polluted and Kalyān the cleaner of the two. On 578 days when both cities reported, Kalyān was cleaner on 402 of them; the average daily gap was 68 AQI points.
Seasonality & days
Kalyān peaks in January, while Katihar peaks in December. Kalyān logged 0.1% Severe days and 46.4% Good-or-Satisfactory days; Katihar was 3.1% Severe and 26.9% Good-or-Satisfactory. Longest clean-air streaks: Kalyān 78 days, Katihar 19 days.
Year-over-year progress
Kalyān has improved by 4 AQI points (4%) from 2019 to 2024; Katihar has improved by 188 AQI points (60.5%) over the same window. The worst recorded day for Kalyān reached AQI 414 at Khadakpada (MPCB) on 2022-01-24; Katihar hit AQI 465 at Mirchaibari (BSPCB) on 2023-01-23.
Station-level disparity
Kalyān spans 2 CPCB stations with a 18-point spread (min 98, max 116); Katihar spans 1 stations with a 0-point spread (min 185, max 185).
Verdict
🏆 Kalyān has better air quality with an AQI of 40 compared to Katihar's 264. That's a significant difference of 224 points.