Bettiah vs Chennai
Side-by-side air quality comparison between Bettiah and Chennai.
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 | Bettiah | Chennai |
|---|---|---|
| CO(ppb) | 703.34 | 637.44 |
| NO2(ppb) | 9.45 | 6.00 |
| O3(ppb) | 10.44 | 14.53 |
| PM10(µg/m³) | 64.41 | 72.13 |
| PM2.5(µg/m³) | 39.70 | 15.93 |
| SO2(ppb) | 5.40 | 1.41 |
| NH3(ppb) | 9.76 | 20.87 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Bettiah averaged an AQI of 127 while Chennai averaged 68 — a 59-point (87%) gap, with Bettiah the more polluted and Chennai the cleaner of the two. On 527 days when both cities reported, Chennai was cleaner on 353 of them; the average daily gap was 87 AQI points.
Seasonality & days
Bettiah peaks in November, while Chennai peaks in December. Bettiah logged 3.2% Severe days and 32.3% Good-or-Satisfactory days; Chennai was 0% Severe and 57.5% Good-or-Satisfactory. Longest clean-air streaks: Bettiah 20 days, Chennai 53 days.
Year-over-year progress
Bettiah has improved by 73 AQI points (36.5%) from 2021 to 2024; Chennai has improved by 25 AQI points (26.9%) over the same window. The worst recorded day for Bettiah reached AQI 470 at Kamalnath Nagar (BSPCB) on 2023-01-01; Chennai hit AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14.
Station-level disparity
Bettiah spans 1 CPCB stations with a 0-point spread (min 173, max 173); Chennai spans 9 stations with a 27-point spread (min 63, max 90).
Verdict
🏆 Bettiah has better air quality with an AQI of 67 compared to Chennai's 73.