Guwahati vs Shillong
Side-by-side air quality comparison between Guwahati and Shillong.
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 | Guwahati | Shillong |
|---|---|---|
| PM2.5(µg/m³) | 31.90 | 17.90 |
| PM10(µg/m³) | 36.00 | 21.40 |
| NO₂(µg/m³) | 5.40 | 3.10 |
| SO₂(µg/m³) | 4.20 | 6.20 |
| O₃(µg/m³) | 97.00 | 118.00 |
| CO(µg/m³) | 393.00 | 304.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Guwahati averaged an AQI of 123 while Shillong averaged 75 — a 48-point (64%) gap, with Guwahati the more polluted and Shillong the cleaner of the two. On 993 days when both cities reported, Shillong was cleaner on 938 of them; the average daily gap was 90 AQI points.
Seasonality & days
Guwahati peaks in January, while Shillong peaks in February. Guwahati logged 0.1% Severe days and 44.9% Good-or-Satisfactory days; Shillong was 0% Severe and 92% Good-or-Satisfactory. Longest clean-air streaks: Guwahati 105 days, Shillong 113 days.
Year-over-year progress
Guwahati has worsened by 14 AQI points (12.8%) from 2019 to 2024; Shillong has worsened by 41 AQI points (120.6%) over the same window. The worst recorded day for Guwahati reached AQI 420 at Railway Colony (PCBA) on 2023-01-15; Shillong hit AQI 212 at Lumpyngngad Shillong (PCB) on 2024-02-19.
Station-level disparity
Guwahati spans 4 CPCB stations with a 26-point spread (min 118, max 144); Shillong spans 2 stations with a 2-point spread (min 42, max 44).
Verdict
🏆 Shillong has better air quality with an AQI of 30 compared to Guwahati's 54.