Gangtok vs Siwan
Side-by-side air quality comparison between Gangtok and Siwan.
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 | Siwan |
|---|---|---|
| PM2.5(µg/m³) | 36.20 | 112.50 |
| PM10(µg/m³) | 45.30 | 127.60 |
| NO₂(µg/m³) | 11.20 | 56.00 |
| SO₂(µg/m³) | 2.50 | 14.90 |
| O₃(µg/m³) | 101.00 | 15.00 |
| CO(µg/m³) | 522.00 | 865.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Gangtok averaged an AQI of 48 while Siwan averaged 148 — a 100-point (208%) gap, with Siwan the more polluted and Gangtok the cleaner of the two. On 575 days when both cities reported, Gangtok was cleaner on 560 of them; the average daily gap was 136 AQI points.
Seasonality & days
Gangtok peaks in March, while Siwan peaks in January. Gangtok logged 0% Severe days and 96.2% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Gangtok 94 days, Siwan 13 days.
Year-over-year progress
Gangtok has worsened by 14 AQI points (41.2%) from 2022 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Gangtok reached AQI 264 at Zero Point GICI (SSPCB) on 2023-01-16; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Gangtok spans 1 CPCB stations with a 0-point spread (min 50, max 50); Siwan spans 1 stations with a 0-point spread (min 197, max 197).
Verdict
🏆 Gangtok has better air quality with an AQI of 61 compared to Siwan's 275. That's a significant difference of 214 points.