Alwar vs Kollam
Side-by-side air quality comparison between Alwar and Kollam.
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 | Alwar | Kollam |
|---|---|---|
| PM2.5(µg/m³) | 58.70 | 4.70 |
| PM10(µg/m³) | 158.30 | 7.20 |
| NO₂(µg/m³) | 14.30 | 4.00 |
| SO₂(µg/m³) | 8.50 | 1.50 |
| O₃(µg/m³) | 76.00 | 31.00 |
| CO(µg/m³) | 357.00 | 91.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Alwar averaged an AQI of 88 while Kollam averaged 84 — a 4-point (5%) gap, with Alwar the more polluted and Kollam the cleaner of the two. On 1400 days when both cities reported, Kollam was cleaner on 761 of them; the average daily gap was 31 AQI points.
Seasonality & days
Alwar peaks in November, while Kollam peaks in January. Alwar logged 0% Severe days and 70.2% Good-or-Satisfactory days; Kollam was 0% Severe and 81% Good-or-Satisfactory. Longest clean-air streaks: Alwar 97 days, Kollam 65 days.
Year-over-year progress
Alwar has improved by 125 AQI points (58.7%) from 2017 to 2024; Kollam has improved by 2 AQI points (2.3%) over the same window. The worst recorded day for Alwar reached AQI 356 at Moti Doongri (RSPCB) on 2017-11-11; Kollam hit AQI 272 at Polayathode Kollam (PCB) on 2024-04-06.
Station-level disparity
Alwar spans 1 CPCB stations with a 0-point spread (min 95, max 95); Kollam spans 1 stations with a 0-point spread (min 84, max 84).
Verdict
🏆 Kollam has better air quality with an AQI of 8 compared to Alwar's 139. That's a significant difference of 131 points.