Kolkata vs Ludhiana
Side-by-side air quality comparison between Kolkata and Ludhiana.
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 | Kolkata | Ludhiana |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 71.50 |
| PM10(µg/m³) | 69.40 | 100.40 |
| NO₂(µg/m³) | 18.10 | 31.30 |
| SO₂(µg/m³) | 13.10 | 17.00 |
| O₃(µg/m³) | 86.00 | 62.00 |
| CO(µg/m³) | 428.00 | 748.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Ludhiana averaged 117 — a 16-point (16%) gap, with Ludhiana the more polluted and Kolkata the cleaner of the two. On 1288 days when both cities reported, Ludhiana was cleaner on 765 of them; the average daily gap was 87 AQI points.
Seasonality & days
Kolkata peaks in January, while Ludhiana peaks in November. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Ludhiana was 0.3% Severe and 53.599999999999994% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Ludhiana 53 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Ludhiana has improved by 79 AQI points (40.3%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Ludhiana hit AQI 488 at Punjab Agricultural University (PPCB) on 2018-06-14.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Ludhiana spans 1 stations with a 0-point spread (min 118, max 118).
Verdict
🏆 Kolkata has better air quality with an AQI of 117 compared to Ludhiana's 139.