Understanding city air quality
Air quality varies by season, weather, and local sources — traffic in megacities, wildfire smoke in dry regions, industrial emissions near ports, and temperature inversions in valleys. A single daily number rarely tells the full story, which is why Aether shows pollutant detail, hourly trends, and multi-day forecasts alongside the headline AQI.
New to air quality? Start with our guides on understanding AQI, safe AQI levels, and seasonal patterns. Or use our best time to go outside tool for any city.