Palwal vs Salem
Side-by-side air quality comparison between Palwal 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 | Palwal | Salem |
|---|---|---|
| PM2.5(µg/m³) | 61.20 | 12.90 |
| PM10(µg/m³) | 137.40 | 15.80 |
| NO₂(µg/m³) | 22.80 | 17.10 |
| SO₂(µg/m³) | 9.70 | 7.50 |
| O₃(µg/m³) | 53.00 | 30.00 |
| CO(µg/m³) | 520.00 | 243.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Palwal averaged an AQI of 95 while Salem averaged 68 — a 27-point (40%) gap, with Palwal the more polluted and Salem the cleaner of the two. On 363 days when both cities reported, Salem was cleaner on 230 of them; the average daily gap was 35 AQI points.
Seasonality & days
Palwal peaks in November, while Salem peaks in April. Palwal logged 0.2% Severe days and 47.800000000000004% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Palwal 37 days, Salem 17 days.
Year-over-year progress
Palwal has improved by 91 AQI points (48.9%) from 2019 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Palwal reached AQI 465 at Shyam Nagar (HSPCB) on 2019-11-14; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Palwal spans 1 CPCB stations with a 0-point spread (min 120, max 120); Salem spans 1 stations with a 0-point spread (min 73, max 73).
Verdict
🏆 Salem has better air quality with an AQI of 22 compared to Palwal's 126. That's a significant difference of 104 points.