Dehradun vs Kolkata
Side-by-side air quality comparison between Dehradun and Kolkata.
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 Kolkata averaged 101 — a 5-point (5%) gap, with Dehradun the more polluted and Kolkata the cleaner of the two. On 502 days when both cities reported, Dehradun was cleaner on 337 of them; the average daily gap was 56 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Dehradun logged 0% Severe days and 62.8% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Dehradun 41 days, Kolkata 75 days.
Year-over-year progress
Dehradun has worsened by 19 AQI points (21.8%) from 2022 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Dehradun reached AQI 327 at Doon University (UKPCB) on 2024-01-19; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Dehradun spans 1 CPCB stations with a 0-point spread (min 98, max 98); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).