Hosur vs Kolkata
Side-by-side air quality comparison between Hosur 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 | Hosur | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 4.50 | 64.70 |
| PM10(µg/m³) | 5.00 | 69.40 |
| NO₂(µg/m³) | 7.50 | 18.10 |
| SO₂(µg/m³) | 4.10 | 13.10 |
| O₃(µg/m³) | 38.00 | 86.00 |
| CO(µg/m³) | 140.00 | 428.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2022, Hosur averaged an AQI of 90 while Kolkata averaged 101 — a 11-point (12%) gap, with Kolkata the more polluted and Hosur the cleaner of the two. On 96 days when both cities reported, Hosur was cleaner on 71 of them; the average daily gap was 103 AQI points.
Seasonality & days
Hosur peaks in December, while Kolkata peaks in January. Hosur logged 0% Severe days and 73.89999999999999% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Hosur 10 days, Kolkata 75 days.
Year-over-year progress
The worst recorded day for Hosur reached AQI 232 at SIPCOT Phase-1 (TNPCB) on 2022-10-25; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Hosur spans 1 CPCB stations with a 0-point spread (min 90, max 90); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Hosur has better air quality with an AQI of 8 compared to Kolkata's 117. That's a significant difference of 109 points.