Patna vs Salem
Side-by-side air quality comparison between Patna 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 | Patna | Salem |
|---|---|---|
| PM2.5(µg/m³) | 97.80 | 12.90 |
| PM10(µg/m³) | 109.40 | 15.80 |
| NO₂(µg/m³) | 40.50 | 17.10 |
| SO₂(µg/m³) | 18.90 | 7.50 |
| O₃(µg/m³) | 52.00 | 30.00 |
| CO(µg/m³) | 667.00 | 243.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Patna averaged an AQI of 172 while Salem averaged 68 — a 104-point (153%) gap, with Patna the more polluted and Salem the cleaner of the two. On 394 days when both cities reported, Salem was cleaner on 388 of them; the average daily gap was 196 AQI points.
Seasonality & days
Patna peaks in December, while Salem peaks in April. Patna logged 7.5% Severe days and 19.400000000000002% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Patna 30 days, Salem 17 days.
Year-over-year progress
Patna has improved by 40 AQI points (18.9%) from 2016 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Patna reached AQI 491 at IGSC Planetarium Complex (BSPCB) on 2016-01-01; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Patna spans 6 CPCB stations with a 39-point spread (min 154, max 193); 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 Patna's 227. That's a significant difference of 205 points.