This dataset includes the number of days in 2017 that the maximum 8-hour average ozone concentration predicted by the Community Multiscale Air Quality modeling system (CMAQ) exceeds a threshold value of 80 ppb. This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (https://www.epa.gov/enviroatlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the contiguous United States. The dataset is available as downloadable data (https://edg.epa.gov/data/Public/ORD/EnviroAtlas) or as an EnviroAtlas map service. Additional descriptive information about each attribute in this dataset can be found in its associated EnviroAtlas Fact Sheet (https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets).

This raster GIS dataset includes the number of days in 2017 that the concentration of particulate matter with a diameter of 2.5 micrometers or smaller (PM2.5) predicted by the Community Multiscale Air Quality modeling system (CMAQ) exceeds a threshold value of 65 micrograms per cubic meter. This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (https://www.epa.gov/enviroatlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the contiguous United States. The dataset is available as downloadable data (https://edg.epa.gov/data/Public/ORD/EnviroAtlas) or as an EnviroAtlas map service. Additional descriptive information about each attribute in this dataset can be found in its associated EnviroAtlas Fact Sheet (https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets).

This web service contains the following layer: CBSA35_2014OzoneAQI_data. Full FGDC metadata record for this layer may be found by clicking the layer name at the web service endpoint (available through the online link provided above) and viewing the layer description.

This web service contains the following layer: OzoneReview35Cities_with2000to2014data. Full FGDC metadata records for each layer may be found by clicking the layer name at the web service endpoint (available through the online link provided above) and viewing the layer description.

Maryland 8-Hour Ozone Concentrations Exceeding 2008 Health-Based Standard in ppb, Finalized Data. In 2008 EPA set the ozone standard to 75 ppb. High levels of ozone can cause health effects including increased asthma attacks and other respiratory effects. You can get more information about the health effects at http://www.epa.gov/air/ozonepollution/. This data set details which monitoring locations in Maryland exceeded the standard during the year and the maximum concentrations on the dates the standard was exceeded. More information on Maryland's air quality monitoring is available at http://www.mde.state.md.us/programs/Air/AirQualityMonitoring/Pages/index.aspx.

Maryland 8-Hour Ozone Concentrations Exceeding 2008 Health-Based Standard in ppb, Finalized Data. In 2008 EPA set the ozone standard to 75 ppb. High levels of ozone can cause health effects including increased asthma attacks and other respiratory effects. You can get more information about the health effects at http://www.epa.gov/air/ozonepollution/. This data set details which monitoring locations in Maryland exceeded the standard during the year and the maximum concentrations on the dates the standard was exceeded. More information on Maryland's air quality monitoring is available at http://www.mde.state.md.us/programs/Air/AirQualityMonitoring/Pages/index.aspx.

Maryland 8-Hour Ozone Concentrations Exceeding 2008 Health-Based Standard in ppb, Finalized Data. In 2008 EPA set the ozone standard to 75 ppb. High levels of ozone can cause health effects including increased asthma attacks and other respiratory effects. You can get more information about the health effects at http://www.epa.gov/air/ozonepollution/. This data set details which monitoring locations in Maryland exceeded the standard during the year and the maximum concentrations on the dates the standard was exceeded. More information on Maryland's air quality monitoring is available at http://www.mde.state.md.us/programs/Air/AirQualityMonitoring/Pages/index.aspx.

Maryland 8-Hour Ozone Concentrations Exceeding 2008 Health-Based Standard in ppb, Finalized Data. In 2008 EPA set the ozone standard to 75 ppb. High levels of ozone can cause health effects including increased asthma attacks and other respiratory effects. You can get more information about the health effects at http://www.epa.gov/air/ozonepollution/. This data set details which monitoring locations in Maryland exceeded the standard during the year and the maximum concentrations on the dates the standard was exceeded. More information on Maryland's air quality monitoring is available at http://www.mde.state.md.us/programs/Air/AirQualityMonitoring/Pages/index.aspx.

Maryland 8-Hour Ozone Concentrations Exceeding 2008 Health-Based Standard in ppb, Finalized Data. In 2008 EPA set the ozone standard to 75 ppb. High levels of ozone can cause health effects including increased asthma attacks and other respiratory effects. You can get more information about the health effects at http://www.epa.gov/air/ozonepollution/. This data set details which monitoring locations in Maryland exceeded the standard during the year and the maximum concentrations on the dates the standard was exceeded. More information on Maryland's air quality monitoring is available at http://www.mde.state.md.us/programs/Air/AirQualityMonitoring/Pages/index.aspx.