Katihar vs Salem
Side-by-side air quality comparison between Katihar 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, Katihar averaged an AQI of 123 while Salem averaged 68 — a 55-point (81%) gap, with Katihar the more polluted and Salem the cleaner of the two. On 347 days when both cities reported, Salem was cleaner on 304 of them; the average daily gap was 131 AQI points.
Seasonality & days
Katihar peaks in December, while Salem peaks in April. Katihar logged 3.1% Severe days and 26.9% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Katihar 19 days, Salem 17 days.
Year-over-year progress
Katihar has improved by 188 AQI points (60.5%) from 2021 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Katihar reached AQI 465 at Mirchaibari (BSPCB) on 2023-01-23; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Katihar spans 1 CPCB stations with a 0-point spread (min 185, max 185); Salem spans 1 stations with a 0-point spread (min 73, max 73).