Bhagalpur vs Siwan
Side-by-side air quality comparison between Bhagalpur 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 | Bhagalpur | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 61.20 | 108.00 |
| PM10(µg/m³) | 65.90 | 122.50 |
| NO₂(µg/m³) | 25.30 | 59.80 |
| SO₂(µg/m³) | 25.40 | 14.10 |
| O₃(µg/m³) | 53.00 | 4.00 |
| CO(µg/m³) | 736.00 | 856.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Bhagalpur averaged an AQI of 164 while Siwan averaged 148 — a 16-point (11%) gap, with Bhagalpur the more polluted and Siwan the cleaner of the two. On 785 days when both cities reported, Siwan was cleaner on 395 of them; the average daily gap was 62 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Bhagalpur logged 1.9% Severe days and 19.9% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Bhagalpur 20 days, Siwan 13 days.
Year-over-year progress
Bhagalpur has improved by 123 AQI points (42.9%) from 2021 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Bhagalpur reached AQI 451 at Mayaganj (BSPCB) on 2022-12-30; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Bhagalpur spans 2 CPCB stations with a 26-point spread (min 170, max 196); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Bhagalpur has better air quality with an AQI of 105 compared to Siwan's 260. That's a significant difference of 155 points.