Chennai vs Ratlam
Side-by-side air quality comparison between Chennai and Ratlam.
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
Pollutant-level comparison (PM2.5, PM10, O3, NO2, SO2, CO)▾
| Pollutant | Chennai | Ratlam |
|---|---|---|
| PM2.5(µg/m³) | 16.60 | 31.00 |
| PM10(µg/m³) | 18.20 | 47.60 |
| NO₂(µg/m³) | 16.20 | 8.60 |
| SO₂(µg/m³) | 9.00 | 15.80 |
| O₃(µg/m³) | 57.00 | 55.00 |
| CO(µg/m³) | 350.00 | 205.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Ratlam averaged 113 — a 45-point (66%) gap, with Ratlam the more polluted and Chennai the cleaner of the two. Across 1589 shared days the head-to-head is almost even, with an average daily gap of 50 AQI points.
Seasonality & days
Chennai peaks in December, while Ratlam peaks in November. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Ratlam was 0% Severe and 46.4% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Ratlam 59 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Ratlam has improved by 19 AQI points (14.4%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Ratlam hit AQI 302 at Shasthri Nagar Ratlam (Lab) on 2020-11-11.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Ratlam spans 1 stations with a 0-point spread (min 103, max 103).
Verdict
🏆 Chennai has better air quality with an AQI of 28 compared to Ratlam's 53.