Shillong vs Tiruchirappalli
Side-by-side air quality comparison between Shillong and Tiruchirappalli.
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 | Shillong | Tiruchirappalli |
|---|---|---|
| PM2.5(µg/m³) | 17.90 | 5.60 |
| PM10(µg/m³) | 21.40 | 6.40 |
| NO₂(µg/m³) | 3.10 | 6.80 |
| SO₂(µg/m³) | 6.20 | 3.40 |
| O₃(µg/m³) | 118.00 | 40.00 |
| CO(µg/m³) | 304.00 | 134.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Shillong averaged an AQI of 75 while Tiruchirappalli averaged 50 — a 25-point (50%) gap, with Shillong the more polluted and Tiruchirappalli the cleaner of the two. Across 40 shared days the head-to-head is almost even, with an average daily gap of 19 AQI points.
Seasonality & days
Shillong peaks in February, while Tiruchirappalli peaks in January. Shillong logged 0% Severe days and 92% Good-or-Satisfactory days; Tiruchirappalli was 0% Severe and 96.5% Good-or-Satisfactory. Longest clean-air streaks: Shillong 113 days, Tiruchirappalli 46 days.
Year-over-year progress
Shillong has worsened by 41 AQI points (120.6%) from 2019 to 2024; Tiruchirappalli has improved by 23 AQI points (31.5%) over the same window. The worst recorded day for Shillong reached AQI 212 at Lumpyngngad Shillong (PCB) on 2024-02-19; Tiruchirappalli hit AQI 114 at St Joseph College (TNPCB) on 2024-01-14.
Station-level disparity
Shillong spans 2 CPCB stations with a 2-point spread (min 42, max 44); Tiruchirappalli spans 1 stations with a 0-point spread (min 52, max 52).
Verdict
🏆 Tiruchirappalli has better air quality with an AQI of 9 compared to Shillong's 30.