Kolār vs Purnia
Side-by-side air quality comparison between Kolār 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 | Kolār | Purnia |
|---|---|---|
| PM2.5(µg/m³) | 5.80 | 88.20 |
| PM10(µg/m³) | 10.80 | 98.70 |
| NO₂(µg/m³) | 1.40 | 2.30 |
| SO₂(µg/m³) | 2.00 | 24.60 |
| O₃(µg/m³) | 86.00 | 239.00 |
| CO(µg/m³) | 137.00 | 359.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolār averaged an AQI of 65 while Purnia averaged 133 — a 68-point (105%) gap, with Purnia the more polluted and Kolār the cleaner of the two. On 434 days when both cities reported, Kolār was cleaner on 394 of them; the average daily gap was 116 AQI points.
Seasonality & days
Kolār peaks in September, while Purnia peaks in January. Kolār logged 0.9% Severe days and 85.30000000000001% Good-or-Satisfactory days; Purnia was 3.7% Severe and 33.699999999999996% Good-or-Satisfactory. Longest clean-air streaks: Kolār 17 days, Purnia 14 days.
Year-over-year progress
Kolār has improved by 56 AQI points (46.3%) from 2018 to 2024; Purnia has improved by 163 AQI points (55.1%) over the same window. The worst recorded day for Kolār reached AQI 500 at Tamaka Ind Area (KSPCB) on 2018-09-18; Purnia hit AQI 460 at Mariam Nagar (BSPCB) on 2022-12-15.
Station-level disparity
Kolār spans 1 CPCB stations with a 0-point spread (min 71, max 71); Purnia spans 1 stations with a 0-point spread (min 176, max 176).
Verdict
🏆 Kolār has better air quality with an AQI of 11 compared to Purnia's 194. That's a significant difference of 183 points.