Howrah vs Kollam
Side-by-side air quality comparison between Howrah 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, Howrah averaged an AQI of 126 while Kollam averaged 84 — a 42-point (50%) gap, with Howrah the more polluted and Kollam the cleaner of the two. On 1119 days when both cities reported, Kollam was cleaner on 763 of them; the average daily gap was 86 AQI points.
Seasonality & days
Howrah peaks in December, while Kollam peaks in January. Howrah logged 0.7% Severe days and 48.7% Good-or-Satisfactory days; Kollam was 0% Severe and 81% Good-or-Satisfactory. Longest clean-air streaks: Howrah 120 days, Kollam 65 days.
Year-over-year progress
Howrah has improved by 32 AQI points (20.3%) from 2016 to 2024; Kollam has improved by 2 AQI points (2.3%) over the same window. The worst recorded day for Howrah reached AQI 500 at Ghusuri (WBPCB) on 2017-04-15; Kollam hit AQI 272 at Polayathode Kollam (PCB) on 2024-04-06.
Station-level disparity
Howrah spans 5 CPCB stations with a 116-point spread (min 111, max 227); Kollam spans 1 stations with a 0-point spread (min 84, max 84).