Samastipur vs Siwan
Side-by-side air quality comparison between Samastipur 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 | Samastipur | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 124.30 | 108.00 |
| PM10(µg/m³) | 140.20 | 122.50 |
| NO₂(µg/m³) | 60.30 | 59.80 |
| SO₂(µg/m³) | 19.10 | 14.10 |
| O₃(µg/m³) | 14.00 | 4.00 |
| CO(µg/m³) | 804.00 | 856.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Samastipur averaged an AQI of 134 while Siwan averaged 148 — a 14-point (10%) gap, with Siwan the more polluted and Samastipur the cleaner of the two. On 586 days when both cities reported, Samastipur was cleaner on 302 of them; the average daily gap was 49 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Samastipur logged 1.4% Severe days and 23.400000000000002% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Samastipur 9 days, Siwan 13 days.
Year-over-year progress
Samastipur has improved by 84 AQI points (38.5%) from 2022 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Samastipur reached AQI 459 at DM Office Kasipur (BSPCB) on 2023-01-01; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Samastipur spans 1 CPCB stations with a 0-point spread (min 177, max 177); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Siwan has better air quality with an AQI of 260 compared to Samastipur's 304.