Howrah vs Ratlam
Side-by-side air quality comparison between Howrah 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 | Howrah | Ratlam |
|---|---|---|
| PM2.5(µg/m³) | 68.70 | 31.00 |
| PM10(µg/m³) | 72.60 | 47.60 |
| NO₂(µg/m³) | 22.20 | 8.60 |
| SO₂(µg/m³) | 11.50 | 15.80 |
| O₃(µg/m³) | 55.00 | 55.00 |
| CO(µg/m³) | 360.00 | 205.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Howrah averaged an AQI of 126 while Ratlam averaged 113 — a 13-point (12%) gap, with Howrah the more polluted and Ratlam the cleaner of the two. On 1590 days when both cities reported, Ratlam was cleaner on 1062 of them; the average daily gap was 83 AQI points.
Seasonality & days
Howrah peaks in December, while Ratlam peaks in November. Howrah logged 0.7% Severe days and 48.7% Good-or-Satisfactory days; Ratlam was 0% Severe and 46.4% Good-or-Satisfactory. Longest clean-air streaks: Howrah 120 days, Ratlam 59 days.
Year-over-year progress
Howrah has improved by 32 AQI points (20.3%) from 2016 to 2024; Ratlam has improved by 19 AQI points (14.4%) over the same window. The worst recorded day for Howrah reached AQI 500 at Ghusuri (WBPCB) on 2017-04-15; Ratlam hit AQI 302 at Shasthri Nagar Ratlam (Lab) on 2020-11-11.
Station-level disparity
Howrah spans 5 CPCB stations with a 116-point spread (min 111, max 227); Ratlam spans 1 stations with a 0-point spread (min 103, max 103).
Verdict
🏆 Ratlam has better air quality with an AQI of 53 compared to Howrah's 130. That's a significant difference of 77 points.