Ratlam vs Salem
Side-by-side air quality comparison between Ratlam and Salem.
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 | Ratlam | Salem |
|---|---|---|
| PM2.5(µg/m³) | 25.00 | 13.70 |
| PM10(µg/m³) | 40.30 | 16.40 |
| NO₂(µg/m³) | 8.90 | 15.30 |
| SO₂(µg/m³) | 16.30 | 9.30 |
| O₃(µg/m³) | 44.00 | 37.00 |
| CO(µg/m³) | 194.00 | 240.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Ratlam averaged an AQI of 113 while Salem averaged 68 — a 45-point (66%) gap, with Ratlam the more polluted and Salem the cleaner of the two. On 373 days when both cities reported, Salem was cleaner on 295 of them; the average daily gap was 44 AQI points.
Seasonality & days
Ratlam peaks in November, while Salem peaks in April. Ratlam logged 0% Severe days and 46.4% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Ratlam 59 days, Salem 17 days.
Year-over-year progress
Ratlam has improved by 19 AQI points (14.4%) from 2018 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Ratlam reached AQI 302 at Shasthri Nagar Ratlam (Lab) on 2020-11-11; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Ratlam spans 1 CPCB stations with a 0-point spread (min 103, max 103); Salem spans 1 stations with a 0-point spread (min 73, max 73).
Verdict
🏆 Salem has better air quality with an AQI of 23 compared to Ratlam's 42.