Delhi vs Salem
Side-by-side air quality comparison between Delhi 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
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Delhi averaged an AQI of 210 while Salem averaged 68 — a 142-point (209%) gap, with Delhi the more polluted and Salem the cleaner of the two. On 394 days when both cities reported, Salem was cleaner on 394 of them; the average daily gap was 244 AQI points.
Seasonality & days
Delhi peaks in November, while Salem peaks in April. Delhi logged 18.7% Severe days and 1.7% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Delhi 3 days, Salem 17 days.
Year-over-year progress
Delhi has improved by 42 AQI points (16.7%) from 2016 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Delhi reached AQI 500 at Ashok Vihar (DPCC) on 2024-11-18; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Delhi spans 39 CPCB stations with a 84-point spread (min 178, max 262); Salem spans 1 stations with a 0-point spread (min 73, max 73).