Ahmedabad vs Kolkata
Side-by-side air quality comparison between Ahmedabad 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 | Ahmedabad | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 25.50 | 48.20 |
| PM10(µg/m³) | 51.00 | 55.50 |
| NO₂(µg/m³) | 5.20 | 6.60 |
| SO₂(µg/m³) | 6.20 | 15.00 |
| O₃(µg/m³) | 51.00 | 155.00 |
| CO(µg/m³) | 173.00 | 485.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Ahmedabad averaged an AQI of 117 while Kolkata averaged 101 — a 16-point (16%) gap, with Ahmedabad the more polluted and Kolkata the cleaner of the two. On 2009 days when both cities reported, Kolkata was cleaner on 1198 of them; the average daily gap was 82 AQI points.
Seasonality & days
Ahmedabad peaks in November, while Kolkata peaks in January. Ahmedabad logged 0.1% Severe days and 23.7% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Ahmedabad 25 days, Kolkata 75 days.
Year-over-year progress
Ahmedabad has worsened by 52 AQI points (80%) from 2016 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Ahmedabad reached AQI 430 at Raikhad (IITM) on 2023-03-17; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Ahmedabad spans 9 CPCB stations with a 44-point spread (min 95, max 139); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Ahmedabad has better air quality with an AQI of 52 compared to Kolkata's 81.