Gangtok vs Salem
Side-by-side air quality comparison between Gangtok 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 | Gangtok | Salem |
|---|---|---|
| PM2.5(µg/m³) | 36.20 | 12.70 |
| PM10(µg/m³) | 45.30 | 15.90 |
| NO₂(µg/m³) | 11.20 | 17.00 |
| SO₂(µg/m³) | 2.50 | 7.00 |
| O₃(µg/m³) | 101.00 | 30.00 |
| CO(µg/m³) | 522.00 | 237.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Gangtok averaged an AQI of 48 while Salem averaged 68 — a 20-point (42%) gap, with Salem the more polluted and Gangtok the cleaner of the two. On 341 days when both cities reported, Gangtok was cleaner on 262 of them; the average daily gap was 32 AQI points.
Seasonality & days
Gangtok peaks in March, while Salem peaks in April. Gangtok logged 0% Severe days and 96.2% Good-or-Satisfactory days; Salem was 0% Severe and 87.1% Good-or-Satisfactory. Longest clean-air streaks: Gangtok 94 days, Salem 17 days.
Year-over-year progress
Gangtok has worsened by 14 AQI points (41.2%) from 2022 to 2024; Salem has improved by 5 AQI points (6.8%) over the same window. The worst recorded day for Gangtok reached AQI 264 at Zero Point GICI (SSPCB) on 2023-01-16; Salem hit AQI 214 at Sona College of Technology (TNPCB) on 2024-01-15.
Station-level disparity
Gangtok spans 1 CPCB stations with a 0-point spread (min 50, max 50); 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 Gangtok's 61.