Coimbatore vs Ratlam
Side-by-side air quality comparison between Coimbatore 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 | Coimbatore | Ratlam |
|---|---|---|
| PM2.5(µg/m³) | 2.40 | 28.60 |
| PM10(µg/m³) | 2.70 | 45.50 |
| NO₂(µg/m³) | 4.70 | 9.50 |
| SO₂(µg/m³) | 2.10 | 16.70 |
| O₃(µg/m³) | 40.00 | 45.00 |
| CO(µg/m³) | 154.00 | 208.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Coimbatore averaged an AQI of 66 while Ratlam averaged 113 — a 47-point (71%) gap, with Ratlam the more polluted and Coimbatore the cleaner of the two. On 895 days when both cities reported, Coimbatore was cleaner on 678 of them; the average daily gap was 48 AQI points.
Seasonality & days
Both cities see their worst air in November on average. Coimbatore logged 0% Severe days and 90.5% Good-or-Satisfactory days; Ratlam was 0% Severe and 46.4% Good-or-Satisfactory. Longest clean-air streaks: Coimbatore 32 days, Ratlam 59 days.
Year-over-year progress
Coimbatore has improved by 5 AQI points (7%) from 2019 to 2024; Ratlam has improved by 19 AQI points (14.4%) over the same window. The worst recorded day for Coimbatore reached AQI 279 at SIDCO Kurichi (TNPCB) on 2024-09-28; Ratlam hit AQI 302 at Shasthri Nagar Ratlam (Lab) on 2020-11-11.
Station-level disparity
Coimbatore spans 2 CPCB stations with a 1-point spread (min 63, max 64); Ratlam spans 1 stations with a 0-point spread (min 103, max 103).
Verdict
🏆 Coimbatore has better air quality with an AQI of 4 compared to Ratlam's 48.