Arrah vs Purnia
Side-by-side air quality comparison between Arrah 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 | Arrah | Purnia |
|---|---|---|
| PM2.5(µg/m³) | 102.90 | 112.00 |
| PM10(µg/m³) | 117.10 | 115.70 |
| NO₂(µg/m³) | 42.70 | 31.10 |
| SO₂(µg/m³) | 15.30 | 18.40 |
| O₃(µg/m³) | 46.00 | 42.00 |
| CO(µg/m³) | 841.00 | 756.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Arrah averaged an AQI of 123 while Purnia averaged 133 — a 10-point (8%) gap, with Purnia the more polluted and Arrah the cleaner of the two. On 686 days when both cities reported, Arrah was cleaner on 369 of them; the average daily gap was 58 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; Purnia was 3.7% Severe and 33.699999999999996% Good-or-Satisfactory. Longest clean-air streaks: Arrah 11 days, Purnia 14 days.
Year-over-year progress
Arrah has improved by 175 AQI points (58.7%) from 2021 to 2024; Purnia has improved by 163 AQI points (55.1%) over the same window. The worst recorded day for Arrah reached AQI 420 at New DM Office (BSPCB) on 2021-12-21; Purnia hit AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15.
Station-level disparity
Arrah spans 1 CPCB stations with a 0-point spread (min 162, max 162); Purnia spans 1 stations with a 0-point spread (min 176, max 176).
Verdict
🏆 Arrah has better air quality with an AQI of 244 compared to Purnia's 274.