Chennai vs Karur
Side-by-side air quality comparison between Chennai and Karur.
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 | Chennai | Karur |
|---|---|---|
| PM2.5(µg/m³) | 11.70 | 3.80 |
| PM10(µg/m³) | 13.10 | 4.20 |
| NO₂(µg/m³) | 14.20 | 6.80 |
| SO₂(µg/m³) | 10.10 | 3.00 |
| O₃(µg/m³) | 56.00 | 38.00 |
| CO(µg/m³) | 308.00 | 131.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Karur averaged 71 — a 3-point (4%) gap, with Karur the more polluted and Chennai the cleaner of the two. On 71 days when both cities reported, Karur was cleaner on 57 of them; the average daily gap was 43 AQI points.
Seasonality & days
Both cities see their worst air in December on average. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Karur was 0% Severe and 80.3% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Karur 34 days.
Year-over-year progress
The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Karur hit AQI 149 at Kamadenu Nagar (TNPCB) on 2024-11-26.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Karur spans 1 stations with a 0-point spread (min 71, max 71).
Verdict
🏆 Karur has better air quality with an AQI of 6 compared to Chennai's 20.