Dehradun vs Salem
Side-by-side air quality comparison between Dehradun 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, Dehradun averaged an AQI of 106 while Salem averaged 68 — a 38-point (56%) gap, with Dehradun the more polluted and Salem the cleaner of the two. On 321 days when both cities reported, Salem was cleaner on 231 of them; the average daily gap was 48 AQI points.
Seasonality & days
Dehradun peaks in January, while Salem peaks in April. Dehradun logged 0% Severe days and 62.8% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Dehradun 41 days, Salem 17 days.
Year-over-year progress
Dehradun has worsened by 19 AQI points (21.8%) from 2022 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Dehradun reached AQI 327 at Doon University (UKPCB) on 2024-01-19; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Dehradun spans 1 CPCB stations with a 0-point spread (min 98, max 98); Salem spans 1 stations with a 0-point spread (min 73, max 73).