Hisar vs Siwan
Side-by-side air quality comparison between Hisar 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 | Hisar | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 75.00 | 108.00 |
| PM10(µg/m³) | 231.00 | 122.50 |
| NO₂(µg/m³) | 42.00 | 59.80 |
| SO₂(µg/m³) | 7.20 | 14.10 |
| O₃(µg/m³) | 25.00 | 4.00 |
| CO(µg/m³) | 573.00 | 856.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Hisar averaged an AQI of 136 while Siwan averaged 148 — a 12-point (9%) gap, with Siwan the more polluted and Hisar the cleaner of the two. On 432 days when both cities reported, Hisar was cleaner on 248 of them; the average daily gap was 72 AQI points.
Seasonality & days
Hisar peaks in November, while Siwan peaks in January. Hisar logged 1.6% Severe days and 29.700000000000003% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Hisar 34 days, Siwan 13 days.
Year-over-year progress
Hisar has improved by 39 AQI points (22.3%) from 2019 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Hisar reached AQI 490 at Urban Estate-II (HSPCB) on 2019-11-02; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Hisar spans 1 CPCB stations with a 0-point spread (min 168, max 168); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Hisar has better air quality with an AQI of 187 compared to Siwan's 260. That's a significant difference of 73 points.