Katihar vs Siwan
Side-by-side air quality comparison between Katihar 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 | Katihar | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 105.90 | 114.60 |
| PM10(µg/m³) | 109.00 | 125.70 |
| NO₂(µg/m³) | 25.20 | 44.50 |
| SO₂(µg/m³) | 20.10 | 15.40 |
| O₃(µg/m³) | 67.00 | 54.00 |
| CO(µg/m³) | 727.00 | 761.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Katihar averaged an AQI of 123 while Siwan averaged 148 — a 25-point (20%) gap, with Siwan the more polluted and Katihar the cleaner of the two. On 703 days when both cities reported, Siwan was cleaner on 376 of them; the average daily gap was 56 AQI points.
Seasonality & days
Katihar peaks in December, while Siwan peaks in January. Katihar logged 3.1% Severe days and 26.9% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Katihar 19 days, Siwan 13 days.
Year-over-year progress
Katihar has improved by 188 AQI points (60.5%) from 2021 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Katihar reached AQI 465 at Mirchaibari (BSPCB) on 2023-01-23; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Katihar spans 1 CPCB stations with a 0-point spread (min 185, max 185); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Katihar has better air quality with an AQI of 253 compared to Siwan's 282.