Kolkata vs Thrissur
Side-by-side air quality comparison between Kolkata and Thrissur.
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 | Thrissur |
|---|---|---|
| PM2.5(µg/m³) | 46.60 | 9.20 |
| PM10(µg/m³) | 54.40 | 11.80 |
| NO₂(µg/m³) | 4.10 | 7.30 |
| SO₂(µg/m³) | 14.60 | 3.00 |
| O₃(µg/m³) | 173.00 | 44.00 |
| CO(µg/m³) | 454.00 | 184.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Thrissur averaged 57 — a 44-point (77%) gap, with Kolkata the more polluted and Thrissur the cleaner of the two. On 851 days when both cities reported, Thrissur was cleaner on 751 of them; the average daily gap was 102 AQI points.
Seasonality & days
Kolkata peaks in January, while Thrissur peaks in February. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Thrissur was 0% Severe and 88.4% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Thrissur 52 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Thrissur has improved by 21 AQI points (26.9%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Thrissur hit AQI 181 at Corporation Ground Thrissur (PCB) on 2023-01-09.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Thrissur spans 1 stations with a 0-point spread (min 68, max 68).
Verdict
🏆 Thrissur has better air quality with an AQI of 15 compared to Kolkata's 78. That's a significant difference of 63 points.