Ratlam vs Shillong
Side-by-side air quality comparison between Ratlam and Shillong.
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 | Shillong |
|---|---|---|
| PM2.5(µg/m³) | 25.00 | 17.90 |
| PM10(µg/m³) | 40.30 | 21.40 |
| NO₂(µg/m³) | 8.90 | 3.10 |
| SO₂(µg/m³) | 16.30 | 6.20 |
| O₃(µg/m³) | 44.00 | 118.00 |
| CO(µg/m³) | 194.00 | 304.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Ratlam averaged an AQI of 113 while Shillong averaged 75 — a 38-point (51%) gap, with Ratlam the more polluted and Shillong the cleaner of the two. On 890 days when both cities reported, Shillong was cleaner on 783 of them; the average daily gap was 58 AQI points.
Seasonality & days
Ratlam peaks in November, while Shillong peaks in February. Ratlam logged 0% Severe days and 46.4% Good-or-Satisfactory days; Shillong was 0% Severe and 92% Good-or-Satisfactory. Longest clean-air streaks: Ratlam 59 days, Shillong 113 days.
Year-over-year progress
Ratlam has improved by 19 AQI points (14.4%) from 2018 to 2024; Shillong has worsened by 41 AQI points (120.6%) over the same window. The worst recorded day for Ratlam reached AQI 302 at Shasthri Nagar Ratlam (Lab) on 2020-11-11; Shillong hit AQI 212 at Lumpyngngad Shillong (PCB) on 2024-02-19.
Station-level disparity
Ratlam spans 1 CPCB stations with a 0-point spread (min 103, max 103); Shillong spans 2 stations with a 2-point spread (min 42, max 44).
Verdict
🏆 Shillong has better air quality with an AQI of 30 compared to Ratlam's 42.