Hajipur vs Salem
Side-by-side air quality comparison between Hajipur 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 | Hajipur | Salem |
|---|---|---|
| PM2.5(µg/m³) | 99.00 | 12.70 |
| PM10(µg/m³) | 111.80 | 15.90 |
| NO₂(µg/m³) | 49.30 | 17.00 |
| SO₂(µg/m³) | 18.10 | 7.00 |
| O₃(µg/m³) | 19.00 | 30.00 |
| CO(µg/m³) | 784.00 | 237.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Hajipur averaged an AQI of 173 while Salem averaged 68 — a 105-point (154%) gap, with Hajipur the more polluted and Salem the cleaner of the two. On 380 days when both cities reported, Salem was cleaner on 337 of them; the average daily gap was 108 AQI points.
Seasonality & days
Hajipur peaks in December, while Salem peaks in April. Hajipur logged 0.3% Severe days and 36.6% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Hajipur 36 days, Salem 17 days.
Year-over-year progress
Hajipur has worsened by 74 AQI points (74.7%) from 2020 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Hajipur reached AQI 427 at Industrial Area (BSPCB) on 2024-11-12; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Hajipur spans 1 CPCB stations with a 0-point spread (min 149, max 149); Salem spans 1 stations with a 0-point spread (min 73, max 73).
Verdict
🏆 Salem has better air quality with an AQI of 21 compared to Hajipur's 231. That's a significant difference of 210 points.