Ambala vs Kolkata
Side-by-side air quality comparison between Ambala 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, Ambala averaged an AQI of 94 while Kolkata averaged 101 — a 7-point (7%) gap, with Kolkata the more polluted and Ambala the cleaner of the two. On 1681 days when both cities reported, Ambala was cleaner on 914 of them; the average daily gap was 75 AQI points.
Seasonality & days
Ambala peaks in November, while Kolkata peaks in January. Ambala logged 0.2% Severe days and 46.5% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Ambala 44 days, Kolkata 75 days.
Year-over-year progress
Ambala has improved by 52 AQI points (35.6%) from 2019 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Ambala reached AQI 452 at Patti Mehar (HSPCB) on 2020-11-04; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Ambala spans 1 CPCB stations with a 0-point spread (min 126, max 126); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).