Arrah vs Chennai
Side-by-side air quality comparison between Arrah 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
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Arrah averaged an AQI of 123 while Chennai averaged 68 — a 55-point (81%) gap, with Arrah the more polluted and Chennai the cleaner of the two. On 559 days when both cities reported, Chennai was cleaner on 346 of them; the average daily gap was 75 AQI points.
Seasonality & days
Arrah peaks in January, while Chennai peaks in December. Arrah logged 0.2% Severe days and 32.3% Good-or-Satisfactory days; Chennai was 0% Severe and 57.5% Good-or-Satisfactory. Longest clean-air streaks: Arrah 11 days, Chennai 53 days.
Year-over-year progress
Arrah has improved by 175 AQI points (58.7%) from 2021 to 2024; Chennai has improved by 25 AQI points (26.9%) over the same window. The worst recorded day for Arrah reached AQI 420 at New DM Office (BSPCB) on 2021-12-21; Chennai hit AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14.
Station-level disparity
Arrah spans 1 CPCB stations with a 0-point spread (min 162, max 162); Chennai spans 9 stations with a 27-point spread (min 63, max 90).