Kalyān vs Purnia
Side-by-side air quality comparison between Kalyān 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, Kalyān averaged an AQI of 95 while Purnia averaged 133 — a 38-point (40%) gap, with Purnia the more polluted and Kalyān the cleaner of the two. On 549 days when both cities reported, Kalyān was cleaner on 374 of them; the average daily gap was 69 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Kalyān logged 0.1% Severe days and 46.4% Good-or-Satisfactory days; Purnia was 3.7% Severe and 33.699999999999996% Good-or-Satisfactory. Longest clean-air streaks: Kalyān 78 days, Purnia 14 days.
Year-over-year progress
Kalyān has improved by 4 AQI points (4%) from 2019 to 2024; Purnia has improved by 163 AQI points (55.1%) over the same window. The worst recorded day for Kalyān reached AQI 414 at Khadakpada (MPCB) on 2022-01-24; Purnia hit AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15.
Station-level disparity
Kalyān spans 2 CPCB stations with a 18-point spread (min 98, max 116); Purnia spans 1 stations with a 0-point spread (min 176, max 176).