Chennai vs Gwalior
Side-by-side air quality comparison between Chennai and Gwalior.
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 | Chennai | Gwalior |
|---|---|---|
| PM2.5(µg/m³) | 11.70 | 39.10 |
| PM10(µg/m³) | 13.10 | 89.40 |
| NO₂(µg/m³) | 14.20 | 12.30 |
| SO₂(µg/m³) | 10.10 | 6.20 |
| O₃(µg/m³) | 56.00 | 61.00 |
| CO(µg/m³) | 308.00 | 248.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Gwalior averaged 136 — a 68-point (100%) gap, with Gwalior the more polluted and Chennai the cleaner of the two. On 1397 days when both cities reported, Chennai was cleaner on 997 of them; the average daily gap was 79 AQI points.
Seasonality & days
Chennai peaks in December, while Gwalior peaks in November. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Gwalior was 0.4% Severe and 31.5% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Gwalior 47 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Gwalior has improved by 12 AQI points (8.1%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Gwalior hit AQI 450 at City Center (MPPCB) on 2021-11-09.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Gwalior spans 4 stations with a 53-point spread (min 112, max 165).
Verdict
🏆 Chennai has better air quality with an AQI of 20 compared to Gwalior's 90. That's a significant difference of 70 points.