Arrah vs Howrah
Side-by-side air quality comparison between Arrah and Howrah.
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 | Arrah | Howrah |
|---|---|---|
| PM2.5(µg/m³) | 102.90 | 64.70 |
| PM10(µg/m³) | 117.10 | 69.40 |
| NO₂(µg/m³) | 42.70 | 18.10 |
| SO₂(µg/m³) | 15.30 | 13.10 |
| O₃(µg/m³) | 46.00 | 86.00 |
| CO(µg/m³) | 841.00 | 421.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Arrah averaged an AQI of 123 while Howrah averaged 126 — a 3-point (2%) gap, with Howrah the more polluted and Arrah the cleaner of the two. On 559 days when both cities reported, Arrah was cleaner on 305 of them; the average daily gap was 72 AQI points.
Seasonality & days
Arrah peaks in January, while Howrah peaks in December. Arrah logged 0.2% Severe days and 32.3% Good-or-Satisfactory days; Howrah was 0.7% Severe and 48.7% Good-or-Satisfactory. Longest clean-air streaks: Arrah 11 days, Howrah 120 days.
Year-over-year progress
Arrah has improved by 175 AQI points (58.7%) from 2021 to 2024; Howrah has improved by 32 AQI points (20.3%) over the same window. The worst recorded day for Arrah reached AQI 420 at New DM Office (BSPCB) on 2021-12-21; Howrah hit AQI 500 at Ghusuri (WBPCB) on 2017-04-15.
Station-level disparity
Arrah spans 1 CPCB stations with a 0-point spread (min 162, max 162); Howrah spans 5 stations with a 116-point spread (min 111, max 227).
Verdict
🏆 Howrah has better air quality with an AQI of 117 compared to Arrah's 244. That's a significant difference of 127 points.