Chapra vs Kalyān
Side-by-side air quality comparison between Chapra 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 | Chapra | Kalyān |
|---|---|---|
| PM2.5(µg/m³) | 99.00 | 22.10 |
| PM10(µg/m³) | 115.50 | 40.40 |
| NO₂(µg/m³) | 53.70 | 23.10 |
| SO₂(µg/m³) | 13.70 | 21.70 |
| O₃(µg/m³) | 10.00 | 19.00 |
| CO(µg/m³) | 858.00 | 174.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chapra averaged an AQI of 149 while Kalyān averaged 95 — a 54-point (57%) gap, with Chapra the more polluted and Kalyān the cleaner of the two. On 585 days when both cities reported, Kalyān was cleaner on 443 of them; the average daily gap was 73 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Chapra logged 2.4% Severe days and 26.8% Good-or-Satisfactory days; Kalyān was 0.1% Severe and 46.4% Good-or-Satisfactory. Longest clean-air streaks: Chapra 14 days, Kalyān 78 days.
Year-over-year progress
Chapra has improved by 181 AQI points (54.8%) from 2021 to 2024; Kalyān has improved by 4 AQI points (4%) over the same window. The worst recorded day for Chapra reached AQI 452 at Darshan Nagar (BSPCB) on 2022-12-20; Kalyān hit AQI 414 at Khadakpada (MPCB) on 2022-01-24.
Station-level disparity
Chapra spans 1 CPCB stations with a 0-point spread (min 195, max 195); Kalyān spans 2 stations with a 18-point spread (min 98, max 116).
Verdict
🏆 Kalyān has better air quality with an AQI of 40 compared to Chapra's 231. That's a significant difference of 191 points.