Chapra vs Kolkata
Side-by-side air quality comparison between Chapra and Kolkata.
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 | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 102.90 | 64.70 |
| PM10(µg/m³) | 117.10 | 69.40 |
| NO₂(µg/m³) | 42.70 | 18.10 |
| SO₂(µg/m³) | 15.30 | 13.10 |
| O₃(µg/m³) | 46.00 | 86.00 |
| CO(µg/m³) | 805.00 | 428.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chapra averaged an AQI of 149 while Kolkata averaged 101 — a 48-point (48%) gap, with Chapra the more polluted and Kolkata the cleaner of the two. On 642 days when both cities reported, Kolkata was cleaner on 448 of them; the average daily gap was 59 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; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Chapra 14 days, Kolkata 75 days.
Year-over-year progress
Chapra has improved by 181 AQI points (54.8%) from 2021 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Chapra reached AQI 452 at Darshan Nagar (BSPCB) on 2022-12-20; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Chapra spans 1 CPCB stations with a 0-point spread (min 195, max 195); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Kolkata has better air quality with an AQI of 117 compared to Chapra's 244. That's a significant difference of 127 points.