Chennai vs Patna
Side-by-side air quality comparison between Chennai and Patna.
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 | Patna |
|---|---|---|
| PM2.5(µg/m³) | 11.70 | 97.80 |
| PM10(µg/m³) | 13.10 | 109.40 |
| NO₂(µg/m³) | 14.20 | 40.50 |
| SO₂(µg/m³) | 10.10 | 18.90 |
| O₃(µg/m³) | 56.00 | 52.00 |
| CO(µg/m³) | 308.00 | 667.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Patna averaged 172 — a 104-point (153%) gap, with Patna the more polluted and Chennai the cleaner of the two. On 2174 days when both cities reported, Chennai was cleaner on 1775 of them; the average daily gap was 127 AQI points.
Seasonality & days
Both cities see their worst air in December on average. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Patna was 7.5% Severe and 19.400000000000002% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Patna 30 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Patna has improved by 40 AQI points (18.9%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Patna hit AQI 491 at IGSC Planetarium Complex (BSPCB) on 2016-01-01.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Patna spans 6 stations with a 39-point spread (min 154, max 193).
Verdict
🏆 Chennai has better air quality with an AQI of 20 compared to Patna's 227. That's a significant difference of 207 points.