Arrah vs Siwan
Side-by-side air quality comparison between Arrah 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 | Arrah | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 102.90 | 114.60 |
| PM10(µg/m³) | 117.10 | 125.70 |
| NO₂(µg/m³) | 42.70 | 44.50 |
| SO₂(µg/m³) | 15.30 | 15.40 |
| O₃(µg/m³) | 46.00 | 54.00 |
| CO(µg/m³) | 841.00 | 761.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Arrah averaged an AQI of 123 while Siwan averaged 148 — a 25-point (20%) gap, with Siwan the more polluted and Arrah the cleaner of the two. On 646 days when both cities reported, Arrah was cleaner on 434 of them; the average daily gap was 62 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Arrah logged 0.2% Severe days and 32.3% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Arrah 11 days, Siwan 13 days.
Year-over-year progress
Arrah has improved by 175 AQI points (58.7%) from 2021 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Arrah reached AQI 420 at New DM Office (BSPCB) on 2021-12-21; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Arrah spans 1 CPCB stations with a 0-point spread (min 162, max 162); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Arrah has better air quality with an AQI of 244 compared to Siwan's 282.