Kolkata vs Tonk
Side-by-side air quality comparison between Kolkata and Tonk.
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 | Tonk |
|---|---|---|
| PM2.5(µg/m³) | 64.70 | 27.80 |
| PM10(µg/m³) | 69.40 | 53.10 |
| NO₂(µg/m³) | 18.10 | 9.00 |
| SO₂(µg/m³) | 13.10 | 4.10 |
| O₃(µg/m³) | 86.00 | 47.00 |
| CO(µg/m³) | 428.00 | 206.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kolkata averaged an AQI of 101 while Tonk averaged 142 — a 41-point (41%) gap, with Tonk the more polluted and Kolkata the cleaner of the two. On 299 days when both cities reported, Kolkata was cleaner on 162 of them; the average daily gap was 52 AQI points.
Seasonality & days
Kolkata peaks in January, while Tonk peaks in November. Kolkata logged 1% Severe days and 47.800000000000004% Good-or-Satisfactory days; Tonk was 0% Severe and 28.200000000000003% Good-or-Satisfactory. Longest clean-air streaks: Kolkata 75 days, Tonk 11 days.
Year-over-year progress
Kolkata has improved by 76 AQI points (42.9%) from 2017 to 2024; Tonk has improved by 14 AQI points (9%) over the same window. The worst recorded day for Kolkata reached AQI 453 at Rabindra Bharati University (WBPCB) on 2019-01-23; Tonk hit AQI 368 at Shastri Nagar (RSPCB) on 2023-11-17.
Station-level disparity
Kolkata spans 7 CPCB stations with a 56-point spread (min 95, max 151); Tonk spans 1 stations with a 0-point spread (min 148, max 148).
Verdict
🏆 Tonk has better air quality with an AQI of 54 compared to Kolkata's 117. That's a significant difference of 63 points.