Gwalior vs Kolkata
Side-by-side air quality comparison between Gwalior 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 | Gwalior | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 40.70 | 71.70 |
| PM10(µg/m³) | 97.60 | 75.70 |
| NO₂(µg/m³) | 14.70 | 22.30 |
| SO₂(µg/m³) | 5.70 | 12.00 |
| O₃(µg/m³) | 49.00 | 60.00 |
| CO(µg/m³) | 247.00 | 392.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Gwalior averaged an AQI of 136 while Kolkata averaged 101 — a 35-point (35%) gap, with Gwalior the more polluted and Kolkata the cleaner of the two. On 1397 days when both cities reported, Kolkata was cleaner on 767 of them; the average daily gap was 60 AQI points.
Seasonality & days
Gwalior peaks in November, while Kolkata peaks in January. Gwalior logged 0.4% Severe days and 31.5% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Gwalior 47 days, Kolkata 75 days.
Year-over-year progress
Gwalior has improved by 12 AQI points (8.1%) from 2020 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Gwalior reached AQI 450 at City Center (MPPCB) on 2021-11-09; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Gwalior spans 4 CPCB stations with a 53-point spread (min 112, max 165); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Gwalior has better air quality with an AQI of 98 compared to Kolkata's 140.