Chennai vs Rohtak
Side-by-side air quality comparison between Chennai and Rohtak.
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 | Rohtak |
|---|---|---|
| PM2.5(µg/m³) | 16.60 | 75.20 |
| PM10(µg/m³) | 18.20 | 166.70 |
| NO₂(µg/m³) | 16.20 | 37.30 |
| SO₂(µg/m³) | 9.00 | 17.50 |
| O₃(µg/m³) | 57.00 | 42.00 |
| CO(µg/m³) | 350.00 | 658.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Chennai averaged an AQI of 68 while Rohtak averaged 148 — a 80-point (118%) gap, with Rohtak the more polluted and Chennai the cleaner of the two. On 2105 days when both cities reported, Chennai was cleaner on 1358 of them; the average daily gap was 88 AQI points.
Seasonality & days
Chennai peaks in December, while Rohtak peaks in November. Chennai logged 0% Severe days and 57.5% Good-or-Satisfactory days; Rohtak was 1.1% Severe and 36.599999999999994% Good-or-Satisfactory. Longest clean-air streaks: Chennai 53 days, Rohtak 45 days.
Year-over-year progress
Chennai has improved by 25 AQI points (26.9%) from 2017 to 2024; Rohtak has improved by 123 AQI points (45.4%) over the same window. The worst recorded day for Chennai reached AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14; Rohtak hit AQI 498 at MD University (HSPCB) on 2019-11-03.
Station-level disparity
Chennai spans 9 CPCB stations with a 27-point spread (min 63, max 90); Rohtak spans 1 stations with a 0-point spread (min 159, max 159).
Verdict
🏆 Chennai has better air quality with an AQI of 28 compared to Rohtak's 151. That's a significant difference of 123 points.