Kannur vs Salem
Side-by-side air quality comparison between Kannur and Salem.
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 | Kannur | Salem |
|---|---|---|
| PM2.5(µg/m³) | 5.70 | 13.70 |
| PM10(µg/m³) | 11.30 | 16.40 |
| NO₂(µg/m³) | 3.30 | 15.30 |
| SO₂(µg/m³) | 1.10 | 9.30 |
| O₃(µg/m³) | 51.00 | 37.00 |
| CO(µg/m³) | 153.00 | 240.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kannur averaged an AQI of 65 while Salem averaged 68 — a 3-point (5%) gap, with Salem the more polluted and Kannur the cleaner of the two. On 277 days when both cities reported, Kannur was cleaner on 170 of them; the average daily gap was 24 AQI points.
Seasonality & days
Kannur peaks in February, while Salem peaks in April. Kannur logged 0% Severe days and 92% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Kannur 103 days, Salem 17 days.
Year-over-year progress
Kannur has worsened by 11 AQI points (20.4%) from 2020 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Kannur reached AQI 258 at Thavakkara Kannur (PCB) on 2021-04-14; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Kannur spans 1 CPCB stations with a 0-point spread (min 66, max 66); Salem spans 1 stations with a 0-point spread (min 73, max 73).
Verdict
🏆 Kannur has better air quality with an AQI of 11 compared to Salem's 23.