Kolkata vs Siliguri
Side-by-side air quality comparison between Kolkata and Siliguri.
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 | Siliguri |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 77.80 |
| PM10(µg/m³) | 69.40 | 98.30 |
| NO₂(µg/m³) | 18.10 | 11.30 |
| SO₂(µg/m³) | 13.10 | 6.80 |
| O₃(µg/m³) | 86.00 | 115.00 |
| CO(µg/m³) | 428.00 | 523.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Siliguri averaged 81 — a 20-point (25%) gap, with Kolkata the more polluted and Siliguri the cleaner of the two. On 1835 days when both cities reported, Siliguri was cleaner on 1516 of them; the average daily gap was 62 AQI points.
Seasonality & days
Kolkata peaks in January, while Siliguri peaks in February. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Siliguri was 0.1% Severe and 61.8% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Siliguri 180 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Siliguri has improved by 39 AQI points (32.5%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Siliguri hit AQI 415 at Ward-32 Bapupara (WBPCB) on 2018-02-08.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Siliguri spans 1 stations with a 0-point spread (min 107, max 107).
Verdict
🏆 Kolkata has better air quality with an AQI of 117 compared to Siliguri's 160.