Kolār vs Siwan
Side-by-side air quality comparison between Kolār 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 | Kolār | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 5.10 | 114.60 |
| PM10(µg/m³) | 6.20 | 125.70 |
| NO₂(µg/m³) | 8.80 | 44.50 |
| SO₂(µg/m³) | 4.30 | 15.40 |
| O₃(µg/m³) | 34.00 | 54.00 |
| CO(µg/m³) | 183.00 | 761.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolār averaged an AQI of 65 while Siwan averaged 148 — a 83-point (128%) gap, with Siwan the more polluted and Kolār the cleaner of the two. On 420 days when both cities reported, Kolār was cleaner on 401 of them; the average daily gap was 123 AQI points.
Seasonality & days
Kolār peaks in September, while Siwan peaks in January. Kolār logged 0.9% Severe days and 85.30000000000001% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Kolār 17 days, Siwan 13 days.
Year-over-year progress
Kolār has improved by 56 AQI points (46.3%) from 2018 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Kolār reached AQI 500 at Tamaka Ind Area (KSPCB) on 2018-09-18; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Kolār 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
🏆 Kolār has better air quality with an AQI of 9 compared to Siwan's 282. That's a significant difference of 273 points.