Karur vs Siwan
Side-by-side air quality comparison between Karur 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 | Karur | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 3.80 | 97.60 |
| PM10(µg/m³) | 4.30 | 111.10 |
| NO₂(µg/m³) | 6.00 | 29.20 |
| SO₂(µg/m³) | 3.10 | 15.80 |
| O₃(µg/m³) | 42.00 | 108.00 |
| CO(µg/m³) | 148.00 | 601.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Karur averaged an AQI of 71 while Siwan averaged 148 — a 77-point (108%) gap, with Siwan the more polluted and Karur the cleaner of the two. On 62 days when both cities reported, Karur was cleaner on 57 of them; the average daily gap was 87 AQI points.
Seasonality & days
Karur peaks in December, while Siwan peaks in January. Karur logged 0% Severe days and 80.3% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Karur 34 days, Siwan 13 days.
Year-over-year progress
The worst recorded day for Karur reached AQI 149 at Kamadenu Nagar (TNPCB) on 2024-11-26; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Karur spans 1 CPCB stations with a 0-point spread (min 71, max 71); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Karur has better air quality with an AQI of 6 compared to Siwan's 226. That's a significant difference of 220 points.