Aizawl vs Kolkata
Side-by-side air quality comparison between Aizawl 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 | Aizawl | Kolkata |
|---|---|---|
| PM2.5(µg/m³) | 23.70 | 64.70 |
| PM10(µg/m³) | 37.30 | 69.40 |
| NO₂(µg/m³) | 2.80 | 18.10 |
| SO₂(µg/m³) | 3.20 | 13.10 |
| O₃(µg/m³) | 83.00 | 86.00 |
| CO(µg/m³) | 222.00 | 428.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Aizawl averaged an AQI of 46 while Kolkata averaged 101 — a 55-point (120%) gap, with Kolkata the more polluted and Aizawl the cleaner of the two. On 1211 days when both cities reported, Aizawl was cleaner on 1172 of them; the average daily gap was 110 AQI points.
Seasonality & days
Aizawl peaks in March, while Kolkata peaks in January. Aizawl logged 0% Severe days and 94.2% Good-or-Satisfactory days; Kolkata was 1% Severe and 47.800000000000004% Good-or-Satisfactory. Longest clean-air streaks: Aizawl 76 days, Kolkata 75 days.
Year-over-year progress
Aizawl has worsened by 16 AQI points (53.3%) from 2020 to 2024; Kolkata has improved by 76 AQI points (42.9%) over the same window. The worst recorded day for Aizawl reached AQI 208 at Sikulpuikawn Aizawl (PCB) on 2021-01-20; Kolkata hit AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23.
Station-level disparity
Aizawl spans 1 CPCB stations with a 0-point spread (min 43, max 43); Kolkata spans 7 stations with a 56-point spread (min 95, max 151).
Verdict
🏆 Aizawl has better air quality with an AQI of 40 compared to Kolkata's 117. That's a significant difference of 77 points.