Hubli-Dharwad vs Kollam
Side-by-side air quality comparison between Hubli-Dharwad and Kollam.
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 | Hubli-Dharwad | Kollam |
|---|---|---|
| PM2.5(µg/m³) | 5.30 | 4.70 |
| PM10(µg/m³) | 8.40 | 7.20 |
| NO₂(µg/m³) | 5.20 | 4.00 |
| SO₂(µg/m³) | 1.20 | 1.50 |
| O₃(µg/m³) | 39.00 | 31.00 |
| CO(µg/m³) | 117.00 | 91.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Hubli-Dharwad averaged an AQI of 64 while Kollam averaged 84 — a 20-point (31%) gap, with Kollam the more polluted and Hubli-Dharwad the cleaner of the two. On 1306 days when both cities reported, Hubli-Dharwad was cleaner on 728 of them; the average daily gap was 30 AQI points.
Seasonality & days
Hubli-Dharwad peaks in February, while Kollam peaks in January. Hubli-Dharwad logged 0% Severe days and 74.1% Good-or-Satisfactory days; Kollam was 0% Severe and 81% Good-or-Satisfactory. Longest clean-air streaks: Hubli-Dharwad 180 days, Kollam 65 days.
Year-over-year progress
Hubli-Dharwad has improved by 18 AQI points (22%) from 2018 to 2024; Kollam has improved by 2 AQI points (2.3%) over the same window. The worst recorded day for Hubli-Dharwad reached AQI 500 at Deshpande Nagar (KSPCB) on 2018-05-21; Kollam hit AQI 272 at Polayathode Kollam (PCB) on 2024-04-06.
Station-level disparity
Hubli-Dharwad spans 2 CPCB stations with a 6-point spread (min 73, max 79); Kollam spans 1 stations with a 0-point spread (min 84, max 84).
Verdict
🏆 Kollam has better air quality with an AQI of 8 compared to Hubli-Dharwad's 9.