Arrah vs Dehradun
Side-by-side air quality comparison between Arrah and Dehradun.
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 | Arrah | Dehradun |
|---|---|---|
| PM2.5(µg/m³) | 102.90 | 14.40 |
| PM10(µg/m³) | 117.10 | 14.60 |
| NO₂(µg/m³) | 42.70 | 25.40 |
| SO₂(µg/m³) | 15.30 | 4.10 |
| O₃(µg/m³) | 46.00 | 71.00 |
| CO(µg/m³) | 841.00 | 350.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Arrah averaged an AQI of 123 while Dehradun averaged 106 — a 17-point (16%) gap, with Arrah the more polluted and Dehradun the cleaner of the two. On 606 days when both cities reported, Dehradun was cleaner on 435 of them; the average daily gap was 72 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Arrah logged 0.2% Severe days and 32.3% Good-or-Satisfactory days; Dehradun was 0% Severe and 62.8% Good-or-Satisfactory. Longest clean-air streaks: Arrah 11 days, Dehradun 41 days.
Year-over-year progress
Arrah has improved by 175 AQI points (58.7%) from 2021 to 2024; Dehradun has worsened by 19 AQI points (21.8%) over the same window. The worst recorded day for Arrah reached AQI 420 at New DM Office (BSPCB) on 2021-12-21; Dehradun hit AQI 327 at Doon University (UKPCB) on 2024-01-19.
Station-level disparity
Arrah spans 1 CPCB stations with a 0-point spread (min 162, max 162); Dehradun spans 1 stations with a 0-point spread (min 98, max 98).
Verdict
🏆 Dehradun has better air quality with an AQI of 24 compared to Arrah's 244. That's a significant difference of 220 points.