Chennai vs Chapra
Side-by-side air quality comparison between Chennai and Chapra.
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 | Chapra |
|---|---|---|
| PM2.5(µg/m³) | 16.60 | 99.00 |
| PM10(µg/m³) | 18.20 | 115.50 |
| NO₂(µg/m³) | 16.20 | 53.70 |
| SO₂(µg/m³) | 9.00 | 13.70 |
| O₃(µg/m³) | 57.00 | 10.00 |
| CO(µg/m³) | 350.00 | 858.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Chapra averaged 149 — a 81-point (119%) gap, with Chapra the more polluted and Chennai the cleaner of the two. On 642 days when both cities reported, Chennai was cleaner on 475 of them; the average daily gap was 104 AQI points.
Seasonality & days
Chennai peaks in December, while Chapra peaks in January. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Chapra was 2.4% Severe and 26.8% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Chapra 14 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Chapra has improved by 181 AQI points (54.8%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Chapra hit AQI 452 at Darshan Nagar (BSPCB) on 2022-12-20.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Chapra spans 1 stations with a 0-point spread (min 195, max 195).
Verdict
🏆 Chennai has better air quality with an AQI of 28 compared to Chapra's 231. That's a significant difference of 203 points.