Howrah vs Siwan
Side-by-side air quality comparison between Howrah and Siwan.
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 | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 114.60 |
| PM10(µg/m³) | 69.40 | 125.70 |
| NO₂(µg/m³) | 18.10 | 44.50 |
| SO₂(µg/m³) | 13.10 | 15.40 |
| O₃(µg/m³) | 86.00 | 54.00 |
| CO(µg/m³) | 421.00 | 761.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Howrah averaged an AQI of 126 while Siwan averaged 148 — a 22-point (17%) gap, with Siwan the more polluted and Howrah the cleaner of the two. On 491 days when both cities reported, Howrah was cleaner on 304 of them; the average daily gap was 81 AQI points.
Seasonality & days
Howrah peaks in December, while Siwan peaks in January. Howrah logged 0.7% Severe days and 48.7% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Howrah 120 days, Siwan 13 days.
Year-over-year progress
Howrah has improved by 32 AQI points (20.3%) from 2016 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Howrah reached AQI 500 at Ghusuri (WBPCB) on 2017-04-15; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Howrah spans 5 CPCB stations with a 116-point spread (min 111, max 227); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Howrah has better air quality with an AQI of 117 compared to Siwan's 282. That's a significant difference of 165 points.