Indore vs Salem
Side-by-side air quality comparison between Indore 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 | Indore | Salem |
|---|---|---|
| PM2.5(µg/m³) | 32.60 | 12.70 |
| PM10(µg/m³) | 47.00 | 15.90 |
| NO₂(µg/m³) | 6.50 | 17.00 |
| SO₂(µg/m³) | 12.50 | 7.00 |
| O₃(µg/m³) | 74.00 | 30.00 |
| CO(µg/m³) | 254.00 | 237.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Indore averaged an AQI of 84 while Salem averaged 68 — a 16-point (24%) gap, with Indore the more polluted and Salem the cleaner of the two. On 208 days when both cities reported, Salem was cleaner on 185 of them; the average daily gap was 69 AQI points.
Seasonality & days
Indore peaks in November, while Salem peaks in April. Indore logged 0% Severe days and 45.099999999999994% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Indore 65 days, Salem 17 days.
Year-over-year progress
Indore has improved by 47 AQI points (35.9%) from 2019 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Indore reached AQI 359 at Maguda Nagar (IMC) on 2024-09-18; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Indore spans 6 CPCB stations with a 69-point spread (min 52, max 121); Salem spans 1 stations with a 0-point spread (min 73, max 73).
Verdict
🏆 Salem has better air quality with an AQI of 21 compared to Indore's 55.