Kolkata vs Vellore
Side-by-side air quality comparison between Kolkata and Vellore.
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, Kolkata averaged an AQI of 101 while Vellore averaged 61 — a 40-point (66%) gap, with Kolkata the more polluted and Vellore the cleaner of the two. On 234 days when both cities reported, Vellore was cleaner on 218 of them; the average daily gap was 76 AQI points.
Seasonality & days
Kolkata peaks in January, while Vellore peaks in December. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Vellore was 0% Severe and 83.5% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Vellore 23 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Vellore has improved by 10 AQI points (14.1%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Vellore hit AQI 245 at Vasanthapuram (TNPCB) on 2024-01-14.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Vellore spans 1 stations with a 0-point spread (min 70, max 70).