Chennai vs Kalyān
Side-by-side air quality comparison between Chennai and Kalyān.
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, Chennai averaged an AQI of 68 while Kalyān averaged 95 — a 27-point (40%) gap, with Kalyān the more polluted and Chennai the cleaner of the two. On 1414 days when both cities reported, Chennai was cleaner on 753 of them; the average daily gap was 60 AQI points.
Seasonality & days
Chennai peaks in December, while Kalyān peaks in January. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Kalyān was 0.1% Severe and 46.4% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Kalyān 78 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Kalyān has improved by 4 AQI points (4%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Kalyān hit AQI 414 at Khadakpada (MPCB) on 2022-01-24.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Kalyān spans 2 stations with a 18-point spread (min 98, max 116).