Delhi vs Purnia
Side-by-side air quality comparison between Delhi 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 | Delhi | Purnia |
|---|---|---|
| PM2.5(µg/m³) | 78.90 | 105.90 |
| PM10(µg/m³) | 153.20 | 109.00 |
| NO₂(µg/m³) | 38.40 | 25.20 |
| SO₂(µg/m³) | 35.10 | 20.10 |
| O₃(µg/m³) | 88.00 | 67.00 |
| CO(µg/m³) | 602.00 | 707.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Delhi averaged an AQI of 210 while Purnia averaged 133 — a 77-point (58%) gap, with Delhi the more polluted and Purnia the cleaner of the two. On 884 days when both cities reported, Purnia was cleaner on 810 of them; the average daily gap was 141 AQI points.
Seasonality & days
Delhi peaks in November, while Purnia peaks in January. Delhi logged 18.7% Severe days and 1.7% Good-or-Satisfactory days; Purnia was 3.7% Severe and 33.699999999999996% Good-or-Satisfactory. Longest clean-air streaks: Delhi 3 days, Purnia 14 days.
Year-over-year progress
Delhi has improved by 42 AQI points (16.7%) from 2016 to 2024; Purnia has improved by 163 AQI points (55.1%) over the same window. The worst recorded day for Delhi reached AQI 500 at Ashok Vihar (DPCC) on 2024-11-18; Purnia hit AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15.
Station-level disparity
Delhi spans 39 CPCB stations with a 84-point spread (min 178, max 262); Purnia spans 1 stations with a 0-point spread (min 176, max 176).
Verdict
🏆 Delhi has better air quality with an AQI of 163 compared to Purnia's 253. That's a significant difference of 90 points.