Coimbatore vs Salem
Side-by-side air quality comparison between Coimbatore 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, Coimbatore averaged an AQI of 66 while Salem averaged 68 — a 2-point (3%) gap, with Salem the more polluted and Coimbatore the cleaner of the two. On 161 days when both cities reported, Salem was cleaner on 101 of them; the average daily gap was 30 AQI points.
Seasonality & days
Coimbatore peaks in November, while Salem peaks in April. Coimbatore logged 0% Severe days and 90.5% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Coimbatore 32 days, Salem 17 days.
Year-over-year progress
Coimbatore has improved by 5 AQI points (7%) from 2019 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Coimbatore reached AQI 279 at SIDCO Kurichi (TNPCB) on 2024-09-28; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Coimbatore spans 2 CPCB stations with a 1-point spread (min 63, max 64); Salem spans 1 stations with a 0-point spread (min 73, max 73).