Air Quality Index (AQI) | AirNow.gov
Local air quality can affect our daily lives. Like the weather, it can change from day to day. EPA developed the Air Quality Index, or AQI, to make information available about the health effects of the five most common air pollutants, and how to avoid those effects.
Air Quality | US EPA - U.S. Environmental Protection Agency
Feb 19, 2025 · The U.S. Air Quality Index is EPA's index for reporting air quality. Every day the AQI tells you how clean or polluted your outdoor air is, along with associated health effects that may be of concern.
Air Quality Index and Real-time Air Quality Data - US EPA
Nov 13, 2024 · The Current AQI and Yesterday's AQI maps are created from ozone and particle data gathered from a nationwide network of state and local air monitoring stations. The maps show the higher of the estimated ozone AQI and PM2.5 AQI.
AQI Basics | AirNow.gov
The U.S. Air Quality Index (AQI) is EPA's tool for communicating about outdoor air quality and health. The AQI includes six color-coded categories, each corresponding to a range of index values. The higher the AQI value, the greater the level of …
Air Data: Air Quality Data Collected at Outdoor Monitors Across …
Jan 7, 2025 · This site provides air quality data collected at outdoor monitors across the United States, Puerto Rico, and the U. S. Virgin Islands. Users can download, output, view or visualize the data.
Air Quality Index Report | US EPA
Jan 13, 2025 · This report provides Air Quality Index annual summary information, including maximum AQI values and the count of days in each AQI category. Read more about what's in this report. Use the query tool below to get AQI reports for one state, county, or CBSA at a time.
AirNow Interactive Map - US EPA
“Ozone and PM” refers to data for Ozone plus PM2.5 plus PM10. Each hour, the highest among these 3 pollutants is displayed for each monitor and each contour. Click on a monitor to reveal …
AQI Calculator | AirNow.gov
Use this box for geographic or location based searches. DIRECTIONS: Select a pollutant, then enter the AQI value. Click on “Calculate” to see the results. AQI Calculator - convert AQI to Concentration. U.S. EPA Scale.
Air Data Basic Information | US EPA - U.S. Environmental …
Nov 20, 2024 · Daily air quality is displayed in terms of the Air Quality Index (AQI) for the criteria pollutants, or in concentration ranges for certain PM species like organic carbon, nitrates, and sulfates. This tool may be useful for tracking an air pollution episode like a wildfire event.
Air Data - AQI Plot | US EPA
Jan 23, 2025 · Compare AQI values for multiple pollutants for a specific location and time period. This tool displays an entire year of AQI values - two pollutants at a time - and is useful for seeing how the number of unhealthy days can vary throughout the year for each pollutant.