Dehradun vs Katihar
Side-by-side air quality comparison between Dehradun and Katihar.
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 | Katihar |
|---|---|---|
| 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 | 727.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Dehradun averaged an AQI of 106 while Katihar averaged 123 — a 17-point (16%) gap, with Katihar the more polluted and Dehradun the cleaner of the two. On 684 days when both cities reported, Dehradun was cleaner on 521 of them; the average daily gap was 83 AQI points.
Seasonality & days
Dehradun peaks in January, while Katihar peaks in December. Dehradun logged 0% Severe days and 62.8% Good-or-Satisfactory days; Katihar was 3.1% Severe and 26.9% Good-or-Satisfactory. Longest clean-air streaks: Dehradun 41 days, Katihar 19 days.
Year-over-year progress
Dehradun has worsened by 19 AQI points (21.8%) from 2022 to 2024; Katihar has improved by 188 AQI points (60.5%) over the same window. The worst recorded day for Dehradun reached AQI 327 at Doon University (UKPCB) on 2024-01-19; Katihar hit AQI 465 at Mirchaibari (BSPCB) on 2023-01-23.
Station-level disparity
Dehradun spans 1 CPCB stations with a 0-point spread (min 98, max 98); Katihar spans 1 stations with a 0-point spread (min 185, max 185).
Verdict
🏆 Dehradun has better air quality with an AQI of 24 compared to Katihar's 253. That's a significant difference of 229 points.