Gangtok vs Kolkata
Side-by-side air quality comparison between Gangtok 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, Gangtok averaged an AQI of 48 while Kolkata averaged 101 — a 53-point (110%) gap, with Kolkata the more polluted and Gangtok the cleaner of the two. On 457 days when both cities reported, Gangtok was cleaner on 445 of them; the average daily gap was 97 AQI points.
Seasonality & days
Gangtok peaks in March, while Kolkata peaks in January. Gangtok logged 0% Severe days and 96.2% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Gangtok 94 days, Kolkata 75 days.
Year-over-year progress
Gangtok has worsened by 14 AQI points (41.2%) from 2022 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Gangtok reached AQI 264 at Zero Point GICI (SSPCB) on 2023-01-16; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Gangtok spans 1 CPCB stations with a 0-point spread (min 50, max 50); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).