Shillong vs Siwan
Side-by-side air quality comparison between Shillong 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
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Shillong averaged an AQI of 75 while Siwan averaged 148 — a 73-point (97%) gap, with Siwan the more polluted and Shillong the cleaner of the two. On 353 days when both cities reported, Shillong was cleaner on 332 of them; the average daily gap was 158 AQI points.
Seasonality & days
Shillong peaks in February, while Siwan peaks in January. Shillong logged 0% Severe days and 92% Good-or-Satisfactory days; Siwan was 5.2% Severe and 17.7% Good-or-Satisfactory. Longest clean-air streaks: Shillong 113 days, Siwan 13 days.
Year-over-year progress
Shillong has worsened by 41 AQI points (120.6%) from 2019 to 2024; Siwan has improved by 184 AQI points (55.4%) over the same window. The worst recorded day for Shillong reached AQI 212 at Lumpyngngad Shillong (PCB) on 2024-02-19; Siwan hit AQI 488 at Chitragupta Nagar (BSPCB) on 2022-12-30.
Station-level disparity
Shillong spans 2 CPCB stations with a 2-point spread (min 42, max 44); Siwan spans 1 stations with a 0-point spread (min 197, max 197).