Kollam vs Shillong
Side-by-side air quality comparison between Kollam 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 | Kollam | Shillong |
|---|---|---|
| PM2.5(µg/m³) | 5.50 | 17.90 |
| PM10(µg/m³) | 7.90 | 21.40 |
| NO₂(µg/m³) | 3.80 | 3.10 |
| SO₂(µg/m³) | 1.60 | 6.20 |
| O₃(µg/m³) | 33.00 | 118.00 |
| CO(µg/m³) | 96.00 | 304.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kollam averaged an AQI of 84 while Shillong averaged 75 — a 9-point (12%) gap, with Kollam the more polluted and Shillong the cleaner of the two. On 730 days when both cities reported, Shillong was cleaner on 649 of them; the average daily gap was 48 AQI points.
Seasonality & days
Kollam peaks in January, while Shillong peaks in February. Kollam logged 0% Severe days and 81% Good-or-Satisfactory days; Shillong was 0% Severe and 92% Good-or-Satisfactory. Longest clean-air streaks: Kollam 65 days, Shillong 113 days.
Year-over-year progress
Kollam has improved by 2 AQI points (2.3%) from 2020 to 2024; Shillong has worsened by 41 AQI points (120.6%) over the same window. The worst recorded day for Kollam reached AQI 272 at Polayathode Kollam (PCB) on 2024-04-06; Shillong hit AQI 212 at Lumpyngngad Shillong (PCB) on 2024-02-19.
Station-level disparity
Kollam spans 1 CPCB stations with a 0-point spread (min 84, max 84); Shillong spans 2 stations with a 2-point spread (min 42, max 44).
Verdict
🏆 Kollam has better air quality with an AQI of 9 compared to Shillong's 30.