Kollam vs Ratlam
Side-by-side air quality comparison between Kollam and Ratlam.
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, Kollam averaged an AQI of 84 while Ratlam averaged 113 — a 29-point (35%) gap, with Ratlam the more polluted and Kollam the cleaner of the two. On 1273 days when both cities reported, Kollam was cleaner on 787 of them; the average daily gap was 41 AQI points.
Seasonality & days
Kollam peaks in January, while Ratlam peaks in November. Kollam logged 0% Severe days and 81% Good-or-Satisfactory days; Ratlam was 0% Severe and 46.4% Good-or-Satisfactory. Longest clean-air streaks: Kollam 65 days, Ratlam 59 days.
Year-over-year progress
Kollam has improved by 2 AQI points (2.3%) from 2020 to 2024; Ratlam has improved by 19 AQI points (14.4%) over the same window. The worst recorded day for Kollam reached AQI 272 at Polayathode Kollam (PCB) on 2024-04-06; Ratlam hit AQI 302 at Shasthri Nagar Ratlam (Lab) on 2020-11-11.
Station-level disparity
Kollam spans 1 CPCB stations with a 0-point spread (min 84, max 84); Ratlam spans 1 stations with a 0-point spread (min 103, max 103).