Purnia vs Vellore
Side-by-side air quality comparison between Purnia and Vellore.
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
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Purnia averaged an AQI of 133 while Vellore averaged 61 — a 72-point (118%) gap, with Purnia the more polluted and Vellore the cleaner of the two. On 248 days when both cities reported, Vellore was cleaner on 229 of them; the average daily gap was 118 AQI points.
Seasonality & days
Purnia peaks in January, while Vellore peaks in December. Purnia logged 3.7% Severe days and 33.699999999999996% Good-or-Satisfactory days; Vellore was 0% Severe and 83.5% Good-or-Satisfactory. Longest clean-air streaks: Purnia 14 days, Vellore 23 days.
Year-over-year progress
Purnia has improved by 163 AQI points (55.1%) from 2021 to 2024; Vellore has improved by 10 AQI points (14.1%) over the same window. The worst recorded day for Purnia reached AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15; Vellore hit AQI 245 at Vasanthapuram (TNPCB) on 2024-01-14.
Station-level disparity
Purnia spans 1 CPCB stations with a 0-point spread (min 176, max 176); Vellore spans 1 stations with a 0-point spread (min 70, max 70).