Siwan vs Virudhunagar
Side-by-side air quality comparison between Siwan and Virudhunagar.
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 | Siwan | Virudhunagar |
|---|---|---|
| PM2.5(µg/m³) | 97.60 | 5.00 |
| PM10(µg/m³) | 111.10 | 5.80 |
| NO₂(µg/m³) | 29.20 | 5.80 |
| SO₂(µg/m³) | 15.80 | 3.00 |
| O₃(µg/m³) | 108.00 | 38.00 |
| CO(µg/m³) | 601.00 | 139.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Siwan averaged an AQI of 148 while Virudhunagar averaged 52 — a 96-point (185%) gap, with Siwan the more polluted and Virudhunagar the cleaner of the two. On 137 days when both cities reported, Virudhunagar was cleaner on 132 of them; the average daily gap was 98 AQI points.
Seasonality & days
Siwan peaks in January, while Virudhunagar peaks in November. Siwan logged 5.2% Severe days and 17.7% Good-or-Satisfactory days; Virudhunagar was 0% Severe and 92.3% Good-or-Satisfactory. Longest clean-air streaks: Siwan 13 days, Virudhunagar 31 days.
Year-over-year progress
The worst recorded day for Siwan reached AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30; Virudhunagar hit AQI 173 at Collectorate Office (TNPCB) on 2024-11-07.
Station-level disparity
Siwan spans 1 CPCB stations with a 0-point spread (min 197, max 197); Virudhunagar spans 1 stations with a 0-point spread (min 52, max 52).
Verdict
🏆 Virudhunagar has better air quality with an AQI of 8 compared to Siwan's 226. That's a significant difference of 218 points.