Hisar vs Kollam
Side-by-side air quality comparison between Hisar 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 | Hisar | Kollam |
|---|---|---|
| PM2.5(µg/m³) | 75.70 | 5.50 |
| PM10(µg/m³) | 224.40 | 7.90 |
| NO₂(µg/m³) | 34.70 | 3.80 |
| SO₂(µg/m³) | 8.30 | 1.60 |
| O₃(µg/m³) | 43.00 | 33.00 |
| CO(µg/m³) | 508.00 | 96.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Hisar averaged an AQI of 136 while Kollam averaged 84 — a 52-point (62%) gap, with Hisar the more polluted and Kollam the cleaner of the two. On 1002 days when both cities reported, Kollam was cleaner on 827 of them; the average daily gap was 96 AQI points.
Seasonality & days
Hisar peaks in November, while Kollam peaks in January. Hisar logged 1.6% Severe days and 29.700000000000003% Good-or-Satisfactory days; Kollam was 0% Severe and 81% Good-or-Satisfactory. Longest clean-air streaks: Hisar 34 days, Kollam 65 days.
Year-over-year progress
Hisar has improved by 39 AQI points (22.3%) from 2019 to 2024; Kollam has improved by 2 AQI points (2.3%) over the same window. The worst recorded day for Hisar reached AQI 490 at Urban Estate-II (HSPCB) on 2019-11-02; Kollam hit AQI 272 at Polayathode Kollam (PCB) on 2024-04-06.
Station-level disparity
Hisar spans 1 CPCB stations with a 0-point spread (min 168, max 168); Kollam spans 1 stations with a 0-point spread (min 84, max 84).
Verdict
🏆 Kollam has better air quality with an AQI of 9 compared to Hisar's 183. That's a significant difference of 174 points.