Kolkata vs Sirohi
Side-by-side air quality comparison between Kolkata and Sirohi.
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 | Sirohi |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 20.00 |
| PM10(µg/m³) | 69.40 | 34.70 |
| NO₂(µg/m³) | 18.10 | 4.30 |
| SO₂(µg/m³) | 13.10 | 2.90 |
| O₃(µg/m³) | 86.00 | 51.00 |
| CO(µg/m³) | 428.00 | 127.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Sirohi averaged 89 — a 12-point (13%) gap, with Kolkata the more polluted and Sirohi the cleaner of the two. On 331 days when both cities reported, Sirohi was cleaner on 241 of them; the average daily gap was 61 AQI points.
Seasonality & days
Kolkata peaks in January, while Sirohi peaks in December. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Sirohi was 0% Severe and 69.2% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Sirohi 41 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Sirohi has improved by 4 AQI points (4.3%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Sirohi hit AQI 335 at Vedhaynath Colony (RSPCB) on 2024-12-26.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Sirohi spans 1 stations with a 0-point spread (min 90, max 90).
Verdict
🏆 Sirohi has better air quality with an AQI of 35 compared to Kolkata's 117. That's a significant difference of 82 points.