Alwar vs Chennai
Side-by-side air quality comparison between Alwar and Chennai.
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 | Alwar | Chennai |
|---|---|---|
| PM2.5(µg/m³) | 58.40 | 16.60 |
| PM10(µg/m³) | 169.00 | 18.20 |
| NO₂(µg/m³) | 17.10 | 16.20 |
| SO₂(µg/m³) | 7.70 | 9.00 |
| O₃(µg/m³) | 58.00 | 57.00 |
| CO(µg/m³) | 391.00 | 350.00 |
CPCB Multi-Year History (2016–2024)
Summary
Overview
In 2024, Alwar averaged an AQI of 88 while Chennai averaged 68 — a 20-point (29%) gap, with Alwar the more polluted and Chennai the cleaner of the two. On 2115 days when both cities reported, Alwar was cleaner on 1294 of them; the average daily gap was 42 AQI points.
Seasonality & days
Alwar peaks in November, while Chennai peaks in December. Alwar logged 0% Severe days and 70.2% Good-or-Satisfactory days; Chennai was 0% Severe and 57.5% Good-or-Satisfactory. Longest clean-air streaks: Alwar 97 days, Chennai 53 days.
Year-over-year progress
Alwar has improved by 125 AQI points (58.7%) from 2017 to 2024; Chennai has improved by 25 AQI points (26.9%) over the same window. The worst recorded day for Alwar reached AQI 356 at Moti Doongri (RSPCB) on 2017-11-11; Chennai hit AQI 391 at Kodungaiyur (TNPCB) on 2021-05-14.
Station-level disparity
Alwar spans 1 CPCB stations with a 0-point spread (min 95, max 95); Chennai spans 9 stations with a 27-point spread (min 63, max 90).
Verdict
🏆 Chennai has better air quality with an AQI of 28 compared to Alwar's 147. That's a significant difference of 119 points.