Kolkata vs Shillong
Side-by-side air quality comparison between Kolkata and Shillong.
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 | Shillong |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 17.90 |
| PM10(µg/m³) | 69.40 | 21.40 |
| NO₂(µg/m³) | 18.10 | 3.10 |
| SO₂(µg/m³) | 13.10 | 6.20 |
| O₃(µg/m³) | 86.00 | 118.00 |
| CO(µg/m³) | 428.00 | 304.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Shillong averaged 75 — a 26-point (35%) gap, with Kolkata the more polluted and Shillong the cleaner of the two. On 997 days when both cities reported, Shillong was cleaner on 956 of them; the average daily gap was 110 AQI points.
Seasonality & days
Kolkata peaks in January, while Shillong peaks in February. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Shillong was 0% Severe and 92% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Shillong 113 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Shillong has worsened by 41 AQI points (120.6%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Shillong hit AQI 212 at Lumpyngngad Shillong (PCB) on 2024-02-19.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Shillong spans 2 stations with a 2-point spread (min 42, max 44).
Verdict
🏆 Shillong has better air quality with an AQI of 30 compared to Kolkata's 117. That's a significant difference of 87 points.