Chennai vs Ludhiana
Side-by-side air quality comparison between Chennai and Ludhiana.
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 | Ludhiana |
|---|---|---|
| PM2.5(µg/m³) | 11.70 | 63.60 |
| PM10(µg/m³) | 13.10 | 103.10 |
| NO₂(µg/m³) | 14.20 | 21.00 |
| SO₂(µg/m³) | 10.10 | 19.20 |
| O₃(µg/m³) | 56.00 | 99.00 |
| CO(µg/m³) | 308.00 | 715.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Ludhiana averaged 117 — a 49-point (72%) gap, with Ludhiana the more polluted and Chennai the cleaner of the two. On 1473 days when both cities reported, Ludhiana was cleaner on 783 of them; the average daily gap was 61 AQI points.
Seasonality & days
Chennai peaks in December, while Ludhiana peaks in November. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Ludhiana was 0.3% Severe and 53.599999999999994% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Ludhiana 53 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Ludhiana has improved by 79 AQI points (40.3%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Ludhiana hit AQI 488 at Punjab Agricultural University (PPCB) on 2018-06-14.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Ludhiana spans 1 stations with a 0-point spread (min 118, max 118).
Verdict
🏆 Chennai has better air quality with an AQI of 20 compared to Ludhiana's 113. That's a significant difference of 93 points.