Katihar vs Kollam
Side-by-side air quality comparison between Katihar and Kollam.
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 Kollam averaged 84 — a 39-point (46%) gap, with Katihar the more polluted and Kollam the cleaner of the two. On 815 days when both cities reported, Kollam was cleaner on 702 of them; the average daily gap was 114 AQI points.
Seasonality & days
Katihar peaks in December, while Kollam peaks in January. Katihar logged 3.1% Severe days and 26.9% Good-or-Satisfactory days; Kollam was 0% Severe and 81% Good-or-Satisfactory. Longest clean-air streaks: Katihar 19 days, Kollam 65 days.
Year-over-year progress
Katihar has improved by 188 AQI points (60.5%) from 2021 to 2024; Kollam has improved by 2 AQI points (2.3%) over the same window. The worst recorded day for Katihar reached AQI 465 at Mirchaibari (BSPCB) on 2023-01-23; Kollam hit AQI 272 at Polayathode Kollam (PCB) on 2024-04-06.
Station-level disparity
Katihar spans 1 CPCB stations with a 0-point spread (min 185, max 185); Kollam spans 1 stations with a 0-point spread (min 84, max 84).