Kollam vs Salem
Side-by-side air quality comparison between Kollam and Salem.
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 Salem averaged 68 — a 16-point (24%) gap, with Kollam the more polluted and Salem the cleaner of the two. On 321 days when both cities reported, Salem was cleaner on 192 of them; the average daily gap was 27 AQI points.
Seasonality & days
Kollam peaks in January, while Salem peaks in April. Kollam logged 0% Severe days and 81% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Kollam 65 days, Salem 17 days.
Year-over-year progress
Kollam has improved by 2 AQI points (2.3%) from 2020 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Kollam reached AQI 272 at Polayathode Kollam (PCB) on 2024-04-06; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Kollam spans 1 CPCB stations with a 0-point spread (min 84, max 84); Salem spans 1 stations with a 0-point spread (min 73, max 73).