Karnal vs Kolkata
Side-by-side air quality comparison between Karnal 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 | Karnal | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 137.40 | 46.60 |
| PM10(µg/m³) | 774.90 | 54.40 |
| NO₂(µg/m³) | 16.00 | 4.10 |
| SO₂(µg/m³) | 26.20 | 14.60 |
| O₃(µg/m³) | 154.00 | 173.00 |
| CO(µg/m³) | 411.00 | 454.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Karnal averaged an AQI of 102 while Kolkata averaged 101 — a 1-point (1%) gap, with Karnal the more polluted and Kolkata the cleaner of the two. On 1677 days when both cities reported, Karnal was cleaner on 949 of them; the average daily gap was 76 AQI points.
Seasonality & days
Karnal peaks in November, while Kolkata peaks in January. Karnal logged 0.1% Severe days and 46.2% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Karnal 53 days, Kolkata 75 days.
Year-over-year progress
Karnal has improved by 71 AQI points (41%) from 2019 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Karnal reached AQI 456 at Sector-12 (HSPCB) on 2019-11-03; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Karnal spans 1 CPCB stations with a 0-point spread (min 128, max 128); 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 Karnal's 500. That's a significant difference of 422 points.