Dehradun vs Purnia
Side-by-side air quality comparison between Dehradun 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 | Dehradun | Purnia |
|---|---|---|
| PM2.5(µg/m³) | 14.40 | 105.90 |
| PM10(µg/m³) | 14.60 | 109.00 |
| NO₂(µg/m³) | 25.40 | 25.20 |
| SO₂(µg/m³) | 4.10 | 20.10 |
| O₃(µg/m³) | 71.00 | 67.00 |
| CO(µg/m³) | 350.00 | 707.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Dehradun averaged an AQI of 106 while Purnia averaged 133 — a 27-point (25%) gap, with Purnia the more polluted and Dehradun the cleaner of the two. On 612 days when both cities reported, Dehradun was cleaner on 466 of them; the average daily gap was 77 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Dehradun logged 0% Severe days and 62.8% Good-or-Satisfactory days; Purnia was 3.7% Severe and 33.699999999999996% Good-or-Satisfactory. Longest clean-air streaks: Dehradun 41 days, Purnia 14 days.
Year-over-year progress
Dehradun has worsened by 19 AQI points (21.8%) from 2022 to 2024; Purnia has improved by 163 AQI points (55.1%) over the same window. The worst recorded day for Dehradun reached AQI 327 at Doon University (UKPCB) on 2024-01-19; Purnia hit AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15.
Station-level disparity
Dehradun spans 1 CPCB stations with a 0-point spread (min 98, max 98); Purnia spans 1 stations with a 0-point spread (min 176, max 176).
Verdict
🏆 Dehradun has better air quality with an AQI of 24 compared to Purnia's 253. That's a significant difference of 229 points.