Chennai vs Hapur
Side-by-side air quality comparison between Chennai and Hapur.
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 | Hapur |
|---|---|---|
| PM2.5(µg/m³) | 11.70 | 69.60 |
| PM10(µg/m³) | 13.10 | 96.40 |
| NO₂(µg/m³) | 14.20 | 27.40 |
| SO₂(µg/m³) | 10.10 | 11.00 |
| O₃(µg/m³) | 56.00 | 65.00 |
| CO(µg/m³) | 308.00 | 548.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Hapur averaged 142 — a 74-point (109%) gap, with Hapur the more polluted and Chennai the cleaner of the two. On 1694 days when both cities reported, Chennai was cleaner on 1131 of them; the average daily gap was 90 AQI points.
Seasonality & days
Chennai peaks in December, while Hapur peaks in November. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Hapur was 1.9% Severe and 36.2% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Hapur 55 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Hapur has improved by 197 AQI points (58.1%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Hapur hit AQI 477 at Anand Vihar (UPPCB) on 2019-10-31.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Hapur spans 1 stations with a 0-point spread (min 159, max 159).
Verdict
🏆 Chennai has better air quality with an AQI of 20 compared to Hapur's 133. That's a significant difference of 113 points.