Asansol vs Salem
Side-by-side air quality comparison between Asansol 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 | Asansol | Salem |
|---|---|---|
| PM2.5(µg/m³) | 64.50 | 7.10 |
| PM10(µg/m³) | 79.60 | 8.30 |
| NO₂(µg/m³) | 8.30 | 1.90 |
| SO₂(µg/m³) | 53.60 | 6.20 |
| O₃(µg/m³) | 248.00 | 116.00 |
| CO(µg/m³) | 418.00 | 164.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Asansol averaged an AQI of 145 while Salem averaged 68 — a 77-point (113%) gap, with Asansol the more polluted and Salem the cleaner of the two. On 208 days when both cities reported, Salem was cleaner on 197 of them; the average daily gap was 120 AQI points.
Seasonality & days
Asansol peaks in December, while Salem peaks in April. Asansol logged 0% Severe days and 43.3% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Asansol 44 days, Salem 17 days.
Year-over-year progress
Asansol has worsened by 12 AQI points (9%) from 2018 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Asansol reached AQI 394 at Court Area (WBPCB) on 2022-12-13; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Asansol spans 4 CPCB stations with a 40-point spread (min 123, max 163); Salem spans 1 stations with a 0-point spread (min 73, max 73).
Verdict
🏆 Salem has better air quality with an AQI of 12 compared to Asansol's 116. That's a significant difference of 104 points.