RDW_LandscapeAndWildlife/TCA_Ozone_Chronic

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Service Description: Two exposure indices were calculated from hourly O3 data collected by the EPA to track effects from chronic O3 exposure (W126 index) and acute O3 exposure (N100). The N100 index is the sum of hours over 100 ppb in a given month and captures peak events of high or acute exposure. The W126 index is a weighted measure of chronic (lower level) ozone exposure with an explanation of its daily, monthly, annual, and multi-year average values is available here: https://www.epa.gov/sites/default/files/2015-09/documents/w126_steps_to_calculate_revised_feb19.pdf. For both indices, hourly data was used to calculate monthly values. Monitoring sites were only included if at least 75% of the hourly observations were available, and monthly values were corrected to account for any missing data following the procedures of Lefohn, Knudsen, and Shadwick (2011, https://webcam.srs.fs.usda.gov/ozone/spatial/2010/contractor_2010.pdf). Corrected monthly values were totaled across the growing season to generate an annual value. Annual values were averaged over the 3 year period (2019 to 2021) to generate a value for each site. Site values were then interpolated using inverse distance weighting to attribute values to landscapes within 40 km of a monitoring site.

Map Name: TCA_Ozone_Chronic_Exposure

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O3_Chronic (0)

Description: Two exposure indices were calculated from hourly O3 data collected by the EPA to track effects from chronic O3 exposure (W126 index) and acute O3 exposure (N100). The N100 index is the sum of hours over 100 ppb in a given month and captures peak events of high or acute exposure. The W126 index is a weighted measure of chronic (lower level) ozone exposure with an explanation of its daily, monthly, annual, and multi-year average values is available here: https://www.epa.gov/sites/default/files/2015-09/documents/w126_steps_to_calculate_revised_feb19.pdf For both indices, hourly data was used to calculate monthly values. Monitoring sites were only included if at least 75% of the hourly observations were available, and monthly values were corrected to account for any missing data following the procedures of Lefohn, Knudsen, and Shadwick (2011, https://webcam.srs.fs.fed.us/ozone/spatial/2010/contractor_2010.pdf). Corrected monthly values were totaled across the growing season to generate an annual value. Annual values were averaged over the 3 year period (2018 to 2020) to generate a value for each site. Site values were then interpolated using inverse distance weighting to attribute values to landscapes within 40 km of a monitoring site.

Copyright Text: The USDA Forest Service makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the accuracy, reliability, completeness or utility of these geospatial data, or for the improper or incorrect use of these geospatial data. These geospatial data and related maps or graphics are not legal documents and are not intended to be used as such. The data and maps may not be used to determine title, ownership, legal descriptions or boundaries, legal jurisdiction, or restrictions that may be in place on either public or private land. Natural hazards may or may not be depicted on the data and maps, and land users should exercise due caution. The data are dynamic and may change over time. The user is responsible to verify the limitations of the geospatial data and to use the data accordingly.

Spatial Reference: 102039 (102039)

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RDW_LandscapeAndWildlife/TCA_Ozone_Chronic_Exposure (MapServer)