Kalyān vs Kolkata
Side-by-side air quality comparison between Kalyān 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 | Kalyān | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 23.70 | 64.70 |
| PM10(µg/m³) | 40.90 | 69.40 |
| NO₂(µg/m³) | 20.60 | 18.10 |
| SO₂(µg/m³) | 23.00 | 13.10 |
| O₃(µg/m³) | 23.00 | 86.00 |
| CO(µg/m³) | 186.00 | 428.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kalyān averaged an AQI of 95 while Kolkata averaged 101 — a 6-point (6%) gap, with Kolkata the more polluted and Kalyān the cleaner of the two. On 1414 days when both cities reported, Kalyān was cleaner on 955 of them; the average daily gap was 58 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Kalyān logged 0.1% Severe days and 46.4% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Kalyān 78 days, Kolkata 75 days.
Year-over-year progress
Kalyān has improved by 4 AQI points (4%) from 2019 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Kalyān reached AQI 414 at Khadakpada (MPCB) on 2022-01-24; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Kalyān spans 2 CPCB stations with a 18-point spread (min 98, max 116); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Kalyān has better air quality with an AQI of 41 compared to Kolkata's 117. That's a significant difference of 76 points.