What time of day typically has the worst air quality?

Addition of the Air Quality Index to asthma action plans led to improved asthma control by Asthma Control Test scores but may decrease outdoor activity. The US Environmental Protection Agency (EPA) has provided a scale called the Air Quality Index (AQI) for rating air quality. Air Quality Index Reports. The AQI reports on five major air pollutants: ozone, particulate matter, sulfur dioxide, carbon monoxide and nitrogen dioxide. An AQI ... Apr 24, 2025 ... How do the numbers work? The index's scale runs from 0 to 500; the higher the number, the worse the air. If the index is registering less than ... Aug 8, 2023 ... The AQI in Lane county is calculated for two major pollutants regulated by the Clean Air Act: ground-level ozone and particulate matter (PM2.5). AQI: The site's current rolling 24-hour average air quality index for PM2.5. About the European Air Quality Index. Click to download the mobile app for Android or iOS. ☰ Jul 12, 2021 ... To see a forecast for an Ohio city, click on a link below. Air quality forecasts are provided by State and local agencies, using US EPA's Air Quality Index ( ... Get informed and learn how to protect yourself from wildland fire smoke. Learn More. Frequently Asked Questions#. What is the U.S. Air Quality Index(AQI)?. Air Quality Index for Health. The Environmental Protection Agency's Air Quality Index for Health (AQIH) is a number from 1 to 10 that tells you what the air ...