Hisar vs Kolkata
Side-by-side air quality comparison between Hisar 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 | Hisar | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 85.70 | 46.60 |
| PM10(µg/m³) | 476.80 | 54.40 |
| NO₂(µg/m³) | 11.30 | 4.10 |
| SO₂(µg/m³) | 9.50 | 14.60 |
| O₃(µg/m³) | 117.00 | 173.00 |
| CO(µg/m³) | 290.00 | 454.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Hisar averaged an AQI of 136 while Kolkata averaged 101 — a 35-point (35%) gap, with Hisar the more polluted and Kolkata the cleaner of the two. On 1670 days when both cities reported, Kolkata was cleaner on 969 of them; the average daily gap was 74 AQI points.
Seasonality & days
Hisar peaks in November, while Kolkata peaks in January. Hisar logged 1.6% Severe days and 29.700000000000003% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Hisar 34 days, Kolkata 75 days.
Year-over-year progress
Hisar has improved by 39 AQI points (22.3%) from 2019 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Hisar reached AQI 490 at Urban Estate-II (HSPCB) on 2019-11-02; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Hisar spans 1 CPCB stations with a 0-point spread (min 168, max 168); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Kolkata has better air quality with an AQI of 78 compared to Hisar's 428. That's a significant difference of 350 points.