Chennai vs Ulhasnagar
Side-by-side air quality comparison between Chennai and Ulhasnagar.
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 Ulhasnagar averaged 117 — a 49-point (72%) gap, with Ulhasnagar the more polluted and Chennai the cleaner of the two. On 353 days when both cities reported, Chennai was cleaner on 182 of them; the average daily gap was 47 AQI points.
Seasonality & days
Chennai peaks in December, while Ulhasnagar peaks in January. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Ulhasnagar was 0% Severe and 46.9% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Ulhasnagar 74 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Ulhasnagar has improved by 10 AQI points (7.9%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Ulhasnagar hit AQI 319 at Sidhi Vinayak Nagar (MPCB) on 2023-11-13.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Ulhasnagar spans 1 stations with a 0-point spread (min 120, max 120).