Kolkata vs Kollam
Side-by-side air quality comparison between Kolkata 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, Kolkata averaged an AQI of 101 while Kollam averaged 84 — a 17-point (20%) gap, with Kolkata the more polluted and Kollam the cleaner of the two. On 1119 days when both cities reported, Kollam was cleaner on 813 of them; the average daily gap was 80 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Kollam was 0% Severe and 81% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Kollam 65 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Kollam has improved by 2 AQI points (2.3%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Kollam hit AQI 272 at Polayathode Kollam (PCB) on 2024-04-06.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Kollam spans 1 stations with a 0-point spread (min 84, max 84).