Chennai vs Ujjain
Side-by-side air quality comparison between Chennai and Ujjain.
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 Ujjain averaged 116 — a 48-point (71%) gap, with Ujjain the more polluted and Chennai the cleaner of the two. On 2130 days when both cities reported, Chennai was cleaner on 1273 of them; the average daily gap was 57 AQI points.
Seasonality & days
Chennai peaks in December, while Ujjain peaks in November. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Ujjain was 0.1% Severe and 33.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Ujjain 67 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Ujjain has improved by 71 AQI points (38%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Ujjain hit AQI 500 at Mahakaleshwar Temple (MPPCB) on 2023-03-10.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Ujjain spans 1 stations with a 0-point spread (min 131, max 131).