Ludhiana vs Salem
Side-by-side air quality comparison between Ludhiana 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 2021, Ludhiana averaged an AQI of 117 while Salem averaged 68 — a 49-point (72%) gap, with Ludhiana the more polluted and Salem the cleaner of the two.
Seasonality & days
Ludhiana peaks in November, while Salem peaks in April. Ludhiana logged 0.3% Severe days and 53.599999999999994% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Ludhiana 53 days, Salem 17 days.
Year-over-year progress
Ludhiana has improved by 79 AQI points (40.3%) from 2017 to 2021; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Ludhiana reached AQI 488 at Punjab Agricultural University (PPCB) on 2018-06-14; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Ludhiana spans 1 CPCB stations with a 0-point spread (min 118, max 118); Salem spans 1 stations with a 0-point spread (min 73, max 73).