Delhi vs Kollam
Side-by-side air quality comparison between Delhi 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 | Delhi | Kollam |
|---|---|---|
| PM2.5(µg/m³) | 80.80 | 5.50 |
| PM10(µg/m³) | 143.90 | 7.90 |
| NO₂(µg/m³) | 41.80 | 3.80 |
| SO₂(µg/m³) | 33.00 | 1.60 |
| O₃(µg/m³) | 63.00 | 33.00 |
| CO(µg/m³) | 568.00 | 96.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Delhi averaged an AQI of 210 while Kollam averaged 84 — a 126-point (150%) gap, with Delhi the more polluted and Kollam the cleaner of the two. On 1422 days when both cities reported, Kollam was cleaner on 1417 of them; the average daily gap was 213 AQI points.
Seasonality & days
Delhi peaks in November, while Kollam peaks in January. Delhi logged 18.7% Severe days and 1.7% Good-or-Satisfactory days; Kollam was 0% Severe and 81% Good-or-Satisfactory. Longest clean-air streaks: Delhi 3 days, Kollam 65 days.
Year-over-year progress
Delhi has improved by 42 AQI points (16.7%) from 2016 to 2024; Kollam has improved by 2 AQI points (2.3%) over the same window. The worst recorded day for Delhi reached AQI 500 at Ashok Vihar (DPCC) on 2024-11-18; Kollam hit AQI 272 at Polayathode Kollam (PCB) on 2024-04-06.
Station-level disparity
Delhi spans 39 CPCB stations with a 84-point spread (min 178, max 262); 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 Delhi's 170. That's a significant difference of 161 points.