Katihar vs Kolkata
Side-by-side air quality comparison between Katihar and Kolkata.
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, Katihar averaged an AQI of 123 while Kolkata averaged 101 — a 22-point (22%) gap, with Katihar the more polluted and Kolkata the cleaner of the two. On 638 days when both cities reported, Kolkata was cleaner on 398 of them; the average daily gap was 58 AQI points.
Seasonality & days
Katihar peaks in December, while Kolkata peaks in January. Katihar logged 3.1% Severe days and 26.9% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Katihar 19 days, Kolkata 75 days.
Year-over-year progress
Katihar has improved by 188 AQI points (60.5%) from 2021 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Katihar reached AQI 465 at Mirchaibari (BSPCB) on 2023-01-23; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Katihar spans 1 CPCB stations with a 0-point spread (min 185, max 185); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).