Hubli-Dharwad vs Kolkata
Side-by-side air quality comparison between Hubli-Dharwad and Kolkata.
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 | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 5.50 | 68.70 |
| PM10(µg/m³) | 8.80 | 72.60 |
| NO₂(µg/m³) | 6.30 | 22.20 |
| SO₂(µg/m³) | 1.20 | 11.50 |
| O₃(µg/m³) | 36.00 | 55.00 |
| CO(µg/m³) | 112.00 | 364.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Hubli-Dharwad averaged an AQI of 64 while Kolkata averaged 101 — a 37-point (58%) gap, with Kolkata the more polluted and Hubli-Dharwad the cleaner of the two. On 1696 days when both cities reported, Hubli-Dharwad was cleaner on 1425 of them; the average daily gap was 87 AQI points.
Seasonality & days
Hubli-Dharwad peaks in February, while Kolkata peaks in January. Hubli-Dharwad logged 0% Severe days and 74.1% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Hubli-Dharwad 180 days, Kolkata 75 days.
Year-over-year progress
Hubli-Dharwad has improved by 18 AQI points (22%) from 2018 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Hubli-Dharwad reached AQI 500 at Deshpande Nagar (KSPCB) on 2018-05-21; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Hubli-Dharwad spans 2 CPCB stations with a 6-point spread (min 73, max 79); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Hubli-Dharwad has better air quality with an AQI of 9 compared to Kolkata's 130. That's a significant difference of 121 points.