Salem vs Vellore
Side-by-side air quality comparison between Salem and Vellore.
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 | Salem | Vellore |
|---|---|---|
| PM2.5(µg/m³) | 13.70 | 7.00 |
| PM10(µg/m³) | 16.40 | 8.40 |
| NO₂(µg/m³) | 15.30 | 8.50 |
| SO₂(µg/m³) | 9.30 | 4.30 |
| O₃(µg/m³) | 37.00 | 44.00 |
| CO(µg/m³) | 240.00 | 141.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Salem averaged an AQI of 68 while Vellore averaged 61 — a 7-point (11%) gap, with Salem the more polluted and Vellore the cleaner of the two. On 162 days when both cities reported, Salem was cleaner on 86 of them; the average daily gap was 21 AQI points.
Seasonality & days
Salem peaks in April, while Vellore peaks in December. Salem logged 0% Severe days and 87.1% Good-or-Satisfactory days; Vellore was 0% Severe and 83.5% Good-or-Satisfactory. Longest clean-air streaks: Salem 17 days, Vellore 23 days.
Year-over-year progress
Salem has improved by 5 AQI points (6.8%) from 2022 to 2024; Vellore has improved by 10 AQI points (14.1%) over the same window. The worst recorded day for Salem reached AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15; Vellore hit AQI 245 at Vasanthapuram (TNPCB) on 2024-01-14.
Station-level disparity
Salem spans 1 CPCB stations with a 0-point spread (min 73, max 73); Vellore spans 1 stations with a 0-point spread (min 70, max 70).
Verdict
🏆 Vellore has better air quality with an AQI of 12 compared to Salem's 23.