Chapra vs Siwan
Side-by-side air quality comparison between Chapra 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 | Chapra | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 99.00 | 108.00 |
| PM10(µg/m³) | 115.50 | 122.50 |
| NO₂(µg/m³) | 53.70 | 59.80 |
| SO₂(µg/m³) | 13.70 | 14.10 |
| O₃(µg/m³) | 10.00 | 4.00 |
| CO(µg/m³) | 858.00 | 856.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chapra averaged an AQI of 149 while Siwan averaged 148 — a 1-point (1%) gap, with Chapra the more polluted and Siwan the cleaner of the two. On 704 days when both cities reported, Siwan was cleaner on 382 of them; the average daily gap was 51 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Chapra logged 2.4% Severe days and 26.8% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Chapra 14 days, Siwan 13 days.
Year-over-year progress
Chapra has improved by 181 AQI points (54.8%) from 2021 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Chapra reached AQI 452 at Darshan Nagar (BSPCB) on 2022-12-20; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Chapra spans 1 CPCB stations with a 0-point spread (min 195, max 195); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Chapra has better air quality with an AQI of 231 compared to Siwan's 260.