Kochi vs Salem
Side-by-side air quality comparison between Kochi 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 | Kochi | Salem |
|---|---|---|
| PM2.5(µg/m³) | 6.60 | 7.10 |
| PM10(µg/m³) | 10.40 | 8.30 |
| NO₂(µg/m³) | 3.20 | 1.90 |
| SO₂(µg/m³) | 2.40 | 6.20 |
| O₃(µg/m³) | 63.00 | 116.00 |
| CO(µg/m³) | 109.00 | 164.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Kochi averaged an AQI of 91 while Salem averaged 68 — a 23-point (34%) gap, with Kochi the more polluted and Salem the cleaner of the two. On 211 days when both cities reported, Salem was cleaner on 149 of them; the average daily gap was 44 AQI points.
Seasonality & days
Kochi peaks in January, while Salem peaks in April. Kochi logged 0% Severe days and 70.9% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Kochi 80 days, Salem 17 days.
Year-over-year progress
Kochi has worsened by 7 AQI points (8.3%) from 2020 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Kochi reached AQI 293 at Vyttila Kochi (PCB) on 2022-12-08; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Kochi spans 1 CPCB stations with a 0-point spread (min 88, max 88); Salem spans 1 stations with a 0-point spread (min 73, max 73).
Verdict
🏆 Kochi has better air quality with an AQI of 11 compared to Salem's 12.