Chandigarh vs Purnia
Side-by-side air quality comparison between Chandigarh 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 | Chandigarh | Purnia |
|---|---|---|
| PM2.5(µg/m³) | 40.70 | 105.90 |
| PM10(µg/m³) | 61.70 | 109.00 |
| NO₂(µg/m³) | 17.10 | 25.20 |
| SO₂(µg/m³) | 13.10 | 20.10 |
| O₃(µg/m³) | 121.00 | 67.00 |
| CO(µg/m³) | 512.00 | 707.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chandigarh averaged an AQI of 153 while Purnia averaged 133 — a 20-point (15%) gap, with Chandigarh the more polluted and Purnia the cleaner of the two. On 883 days when both cities reported, Purnia was cleaner on 462 of them; the average daily gap was 74 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Chandigarh logged 0.3% Severe days and 39.9% Good-or-Satisfactory days; Purnia was 3.7% Severe and 33.699999999999996% Good-or-Satisfactory. Longest clean-air streaks: Chandigarh 92 days, Purnia 14 days.
Year-over-year progress
Chandigarh has worsened by 27 AQI points (21.4%) from 2019 to 2024; Purnia has improved by 163 AQI points (55.1%) over the same window. The worst recorded day for Chandigarh reached AQI 452 at Sector-53 (CPCC) on 2022-11-09; Purnia hit AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15.
Station-level disparity
Chandigarh spans 3 CPCB stations with a 43-point spread (min 107, max 150); Purnia spans 1 stations with a 0-point spread (min 176, max 176).
Verdict
🏆 Chandigarh has better air quality with an AQI of 68 compared to Purnia's 253. That's a significant difference of 185 points.