Chennai vs Shillong
Side-by-side air quality comparison between Chennai 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
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Shillong averaged 75 — a 7-point (10%) gap, with Shillong the more polluted and Chennai the cleaner of the two. On 997 days when both cities reported, Shillong was cleaner on 880 of them; the average daily gap was 67 AQI points.
Seasonality & days
Chennai peaks in December, while Shillong peaks in February. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Shillong was 0% Severe and 92% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Shillong 113 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Shillong has worsened by 41 AQI points (120.6%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Shillong hit AQI 212 at Lumpyngngad Shillong (PCB) on 2024-02-19.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Shillong spans 2 stations with a 2-point spread (min 42, max 44).