Saharsa vs Salem
Side-by-side air quality comparison between Saharsa 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 | Saharsa | Salem |
|---|---|---|
| PM2.5(µg/m³) | 99.90 | 13.70 |
| PM10(µg/m³) | 105.70 | 16.40 |
| NO₂(µg/m³) | 26.10 | 15.30 |
| SO₂(µg/m³) | 13.00 | 9.30 |
| O₃(µg/m³) | 62.00 | 37.00 |
| CO(µg/m³) | 670.00 | 240.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Saharsa averaged an AQI of 139 while Salem averaged 68 — a 71-point (104%) gap, with Saharsa the more polluted and Salem the cleaner of the two. On 329 days when both cities reported, Salem was cleaner on 283 of them; the average daily gap was 122 AQI points.
Seasonality & days
Saharsa peaks in January, while Salem peaks in April. Saharsa logged 1.4% Severe days and 28.4% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Saharsa 20 days, Salem 17 days.
Year-over-year progress
Saharsa has improved by 139 AQI points (50%) from 2021 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Saharsa reached AQI 454 at Police Line (BSPCB) on 2022-12-13; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Saharsa spans 1 CPCB stations with a 0-point spread (min 188, max 188); Salem spans 1 stations with a 0-point spread (min 73, max 73).
Verdict
🏆 Salem has better air quality with an AQI of 23 compared to Saharsa's 234. That's a significant difference of 211 points.