Coimbatore vs Vellore
Side-by-side air quality comparison between Coimbatore and Vellore.
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 | Coimbatore | Vellore |
|---|---|---|
| PM2.5(µg/m³) | 2.50 | 8.00 |
| PM10(µg/m³) | 3.00 | 10.00 |
| NO₂(µg/m³) | 4.60 | 11.40 |
| SO₂(µg/m³) | 2.00 | 4.50 |
| O₃(µg/m³) | 40.00 | 41.00 |
| CO(µg/m³) | 163.00 | 175.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Coimbatore averaged an AQI of 66 while Vellore averaged 61 — a 5-point (8%) gap, with Coimbatore the more polluted and Vellore the cleaner of the two. On 193 days when both cities reported, Vellore was cleaner on 114 of them; the average daily gap was 21 AQI points.
Seasonality & days
Coimbatore peaks in November, while Vellore peaks in December. Coimbatore logged 0% Severe days and 90.5% Good-or-Satisfactory days; Vellore was 0% Severe and 83.5% Good-or-Satisfactory. Longest clean-air streaks: Coimbatore 32 days, Vellore 23 days.
Year-over-year progress
Coimbatore has improved by 5 AQI points (7%) from 2019 to 2024; Vellore has improved by 10 AQI points (14.1%) over the same window. The worst recorded day for Coimbatore reached AQI 279 at SIDCO Kurichi (TNPCB) on 2024-09-28; Vellore hit AQI 245 at Vasanthapuram (TNPCB) on 2024-01-14.
Station-level disparity
Coimbatore spans 2 CPCB stations with a 1-point spread (min 63, max 64); Vellore spans 1 stations with a 0-point spread (min 70, max 70).
Verdict
🏆 Coimbatore has better air quality with an AQI of 4 compared to Vellore's 13.