Noida vs Salem
Side-by-side air quality comparison between Noida 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 | Noida | Salem |
|---|---|---|
| PM2.5(µg/m³) | 67.50 | 12.70 |
| PM10(µg/m³) | 134.10 | 15.90 |
| NO₂(µg/m³) | 34.90 | 17.00 |
| SO₂(µg/m³) | 17.50 | 7.00 |
| O₃(µg/m³) | 48.00 | 30.00 |
| CO(µg/m³) | 554.00 | 237.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Noida averaged an AQI of 182 while Salem averaged 68 — a 114-point (168%) gap, with Noida the more polluted and Salem the cleaner of the two. On 208 days when both cities reported, Salem was cleaner on 208 of them; the average daily gap was 178 AQI points.
Seasonality & days
Noida peaks in November, while Salem peaks in April. Noida logged 8.9% Severe days and 16.5% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Noida 14 days, Salem 17 days.
Year-over-year progress
Noida has improved by 79 AQI points (30.3%) from 2017 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Noida reached AQI 500 at Sector-1 (UPPCB) on 2019-11-01; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Noida spans 4 CPCB stations with a 15-point spread (min 195, max 210); 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 Noida's 126. That's a significant difference of 105 points.