Chennai vs Katihar
Side-by-side air quality comparison between Chennai and Katihar.
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, Chennai averaged an AQI of 68 while Katihar averaged 123 — a 55-point (81%) gap, with Katihar the more polluted and Chennai the cleaner of the two. On 638 days when both cities reported, Chennai was cleaner on 456 of them; the average daily gap was 98 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; Katihar was 3.1% Severe and 26.9% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Katihar 19 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Katihar has improved by 188 AQI points (60.5%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Katihar hit AQI 465 at Mirchaibari (BSPCB) on 2023-01-23.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Katihar spans 1 stations with a 0-point spread (min 185, max 185).