Howrah vs Salem
Side-by-side air quality comparison between Howrah 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, Howrah averaged an AQI of 126 while Salem averaged 68 — a 58-point (85%) gap, with Howrah the more polluted and Salem the cleaner of the two. On 208 days when both cities reported, Salem was cleaner on 179 of them; the average daily gap was 119 AQI points.
Seasonality & days
Howrah peaks in December, while Salem peaks in April. Howrah logged 0.7% Severe days and 48.7% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Howrah 120 days, Salem 17 days.
Year-over-year progress
Howrah has improved by 32 AQI points (20.3%) from 2016 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Howrah reached AQI 500 at Ghusuri (WBPCB) on 2017-04-15; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Howrah spans 5 CPCB stations with a 116-point spread (min 111, max 227); Salem spans 1 stations with a 0-point spread (min 73, max 73).