Katihar vs Purnia
Side-by-side air quality comparison between Katihar 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 | Katihar | Purnia |
|---|---|---|
| PM2.5(µg/m³) | 105.90 | 105.90 |
| PM10(µg/m³) | 109.00 | 109.00 |
| NO₂(µg/m³) | 25.20 | 25.20 |
| SO₂(µg/m³) | 20.10 | 20.10 |
| O₃(µg/m³) | 67.00 | 67.00 |
| CO(µg/m³) | 727.00 | 707.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Katihar averaged an AQI of 123 while Purnia averaged 133 — a 10-point (8%) gap, with Purnia the more polluted and Katihar the cleaner of the two. On 777 days when both cities reported, Purnia was cleaner on 435 of them; the average daily gap was 39 AQI points.
Seasonality & days
Katihar peaks in December, while Purnia peaks in January. Katihar logged 3.1% Severe days and 26.9% Good-or-Satisfactory days; Purnia was 3.7% Severe and 33.699999999999996% Good-or-Satisfactory. Longest clean-air streaks: Katihar 19 days, Purnia 14 days.
Year-over-year progress
Katihar has improved by 188 AQI points (60.5%) from 2021 to 2024; Purnia has improved by 163 AQI points (55.1%) over the same window. The worst recorded day for Katihar reached AQI 465 at Mirchaibari (BSPCB) on 2023-01-23; Purnia hit AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15.
Station-level disparity
Katihar spans 1 CPCB stations with a 0-point spread (min 185, max 185); Purnia spans 1 stations with a 0-point spread (min 176, max 176).
Verdict
Both Katihar and Purnia have the same AQI of 253 right now.