Kollam vs Purnia
Side-by-side air quality comparison between Kollam 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
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kollam averaged an AQI of 84 while Purnia averaged 133 — a 49-point (58%) gap, with Purnia the more polluted and Kollam the cleaner of the two. On 738 days when both cities reported, Kollam was cleaner on 622 of them; the average daily gap was 104 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Kollam logged 0% Severe days and 81% Good-or-Satisfactory days; Purnia was 3.7% Severe and 33.699999999999996% Good-or-Satisfactory. Longest clean-air streaks: Kollam 65 days, Purnia 14 days.
Year-over-year progress
Kollam has improved by 2 AQI points (2.3%) from 2020 to 2024; Purnia has improved by 163 AQI points (55.1%) over the same window. The worst recorded day for Kollam reached AQI 272 at Polayathode Kollam (PCB) on 2024-04-06; Purnia hit AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15.
Station-level disparity
Kollam spans 1 CPCB stations with a 0-point spread (min 84, max 84); Purnia spans 1 stations with a 0-point spread (min 176, max 176).