Kollam vs Tonk
Side-by-side air quality comparison between Kollam 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 | Kollam | Tonk |
|---|---|---|
| PM2.5(µg/m³) | 4.60 | 34.90 |
| PM10(µg/m³) | 7.10 | 75.90 |
| NO₂(µg/m³) | 4.40 | 14.10 |
| SO₂(µg/m³) | 1.50 | 4.50 |
| O₃(µg/m³) | 30.00 | 38.00 |
| CO(µg/m³) | 89.00 | 239.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kollam averaged an AQI of 84 while Tonk averaged 142 — a 58-point (69%) gap, with Tonk the more polluted and Kollam the cleaner of the two. On 466 days when both cities reported, Kollam was cleaner on 375 of them; the average daily gap was 77 AQI points.
Seasonality & days
Kollam peaks in January, while Tonk peaks in November. Kollam logged 0% Severe days and 81% Good-or-Satisfactory days; Tonk was 0% Severe and 28.200000000000003% Good-or-Satisfactory. Longest clean-air streaks: Kollam 65 days, Tonk 11 days.
Year-over-year progress
Kollam has improved by 2 AQI points (2.3%) from 2020 to 2024; Tonk has improved by 14 AQI points (9%) over the same window. The worst recorded day for Kollam reached AQI 272 at Polayathode Kollam (PCB) on 2024-04-06; Tonk hit AQI 368 at Shastri Nagar (RSPCB) on 2023-11-17.
Station-level disparity
Kollam spans 1 CPCB stations with a 0-point spread (min 84, max 84); Tonk spans 1 stations with a 0-point spread (min 148, max 148).
Verdict
🏆 Kollam has better air quality with an AQI of 8 compared to Tonk's 76. That's a significant difference of 68 points.