Purnia vs Salem
Side-by-side air quality comparison between Purnia and Salem.
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 Salem averaged 68 — a 65-point (96%) gap, with Purnia the more polluted and Salem the cleaner of the two. On 309 days when both cities reported, Salem was cleaner on 268 of them; the average daily gap was 126 AQI points.
Seasonality & days
Purnia peaks in January, while Salem peaks in April. Purnia logged 3.7% Severe days and 33.699999999999996% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Purnia 14 days, Salem 17 days.
Year-over-year progress
Purnia has improved by 163 AQI points (55.1%) from 2021 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Purnia reached AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Purnia spans 1 CPCB stations with a 0-point spread (min 176, max 176); Salem spans 1 stations with a 0-point spread (min 73, max 73).