Ludhiana vs Purnia
Side-by-side air quality comparison between Ludhiana and Purnia.
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 | Purnia |
|---|---|---|
| PM2.5(µg/m³) | 71.50 | 105.90 |
| PM10(µg/m³) | 100.40 | 109.00 |
| NO₂(µg/m³) | 31.30 | 25.20 |
| SO₂(µg/m³) | 17.00 | 20.10 |
| O₃(µg/m³) | 62.00 | 67.00 |
| CO(µg/m³) | 748.00 | 707.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2021, Ludhiana averaged an AQI of 117 while Purnia averaged 133 — a 16-point (14%) gap, with Purnia the more polluted and Ludhiana the cleaner of the two. On 33 days when both cities reported, Ludhiana was cleaner on 29 of them; the average daily gap was 121 AQI points.
Seasonality & days
Ludhiana peaks in November, while Purnia peaks in January. Ludhiana logged 0.3% Severe days and 53.599999999999994% Good-or-Satisfactory days; Purnia was 3.7% Severe and 33.699999999999996% Good-or-Satisfactory. Longest clean-air streaks: Ludhiana 53 days, Purnia 14 days.
Year-over-year progress
Ludhiana has improved by 79 AQI points (40.3%) from 2017 to 2021; Purnia has improved by 163 AQI points (55.1%) over the same window. The worst recorded day for Ludhiana reached AQI 488 at Punjab Agricultural University (PPCB) on 2018-06-14; Purnia hit AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15.
Station-level disparity
Ludhiana spans 1 CPCB stations with a 0-point spread (min 118, max 118); Purnia spans 1 stations with a 0-point spread (min 176, max 176).
Verdict
🏆 Ludhiana has better air quality with an AQI of 139 compared to Purnia's 253. That's a significant difference of 114 points.