Chennai vs Ghaziabad
Side-by-side air quality comparison between Chennai and Ghaziabad.
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 | Ghaziabad |
|---|---|---|
| PM2.5(µg/m³) | 13.90 | 71.20 |
| PM10(µg/m³) | 15.30 | 96.40 |
| NO₂(µg/m³) | 15.00 | 33.50 |
| SO₂(µg/m³) | 9.10 | 11.10 |
| O₃(µg/m³) | 56.00 | 42.00 |
| CO(µg/m³) | 316.00 | 548.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Ghaziabad averaged 177 — a 109-point (160%) gap, with Ghaziabad the more polluted and Chennai the cleaner of the two. On 2271 days when both cities reported, Chennai was cleaner on 1960 of them; the average daily gap was 149 AQI points.
Seasonality & days
Chennai peaks in December, while Ghaziabad peaks in November. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Ghaziabad was 12.2% Severe and 13.700000000000001% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Ghaziabad 19 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Ghaziabad has improved by 115 AQI points (39.4%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Ghaziabad hit AQI 500 at Vasundhara (UPPCB) on 2017-12-21.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Ghaziabad spans 4 stations with a 30-point spread (min 198, max 228).
Verdict
🏆 Chennai has better air quality with an AQI of 23 compared to Ghaziabad's 138. That's a significant difference of 115 points.