Kochi vs Kolkata
Side-by-side air quality comparison between Kochi 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 | Kochi | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 8.80 | 64.70 |
| PM10(µg/m³) | 11.60 | 69.40 |
| NO₂(µg/m³) | 8.90 | 18.10 |
| SO₂(µg/m³) | 2.70 | 13.10 |
| O₃(µg/m³) | 30.00 | 86.00 |
| CO(µg/m³) | 119.00 | 428.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kochi averaged an AQI of 91 while Kolkata averaged 101 — a 10-point (11%) gap, with Kolkata the more polluted and Kochi the cleaner of the two. On 902 days when both cities reported, Kochi was cleaner on 671 of them; the average daily gap was 83 AQI points.
Seasonality & days
Both cities see their worst air in January on average. Kochi logged 0% Severe days and 70.9% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Kochi 80 days, Kolkata 75 days.
Year-over-year progress
Kochi has worsened by 7 AQI points (8.3%) from 2020 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Kochi reached AQI 293 at Vyttila Kochi (PCB) on 2022-12-08; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Kochi spans 1 CPCB stations with a 0-point spread (min 88, max 88); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Kochi has better air quality with an AQI of 15 compared to Kolkata's 117. That's a significant difference of 102 points.