Ludhiana vs Siwan
Side-by-side air quality comparison between Ludhiana 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 | Ludhiana | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 71.50 | 114.60 |
| PM10(µg/m³) | 100.40 | 125.70 |
| NO₂(µg/m³) | 31.30 | 44.50 |
| SO₂(µg/m³) | 17.00 | 15.40 |
| O₃(µg/m³) | 62.00 | 54.00 |
| CO(µg/m³) | 748.00 | 761.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2021, Ludhiana averaged an AQI of 117 while Siwan averaged 148 — a 31-point (26%) gap, with Siwan the more polluted and Ludhiana the cleaner of the two. On 31 days when both cities reported, Ludhiana was cleaner on 30 of them; the average daily gap was 150 AQI points.
Seasonality & days
Ludhiana peaks in November, while Siwan peaks in January. Ludhiana logged 0.3% Severe days and 53.599999999999994% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Ludhiana 53 days, Siwan 13 days.
Year-over-year progress
Ludhiana has improved by 79 AQI points (40.3%) from 2017 to 2021; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Ludhiana reached AQI 488 at Punjab Agricultural University (PPCB) on 2018-06-14; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Ludhiana spans 1 CPCB stations with a 0-point spread (min 118, max 118); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Ludhiana has better air quality with an AQI of 139 compared to Siwan's 282. That's a significant difference of 143 points.