This is a combination of two datasets:
(1) LA County tree canopy data from TreePeople/University of Vermont
(2) LA County land cover data, 2014 imagery (Los Angeles Regional Imagery Acquisition Consortium)
Urban and rural tree canopy areas and percentages. Urban areas are defined as those census block groups whose centroids are within the Census’s “Urban Areas” shapefile.

Percentage of daily samples taken over a 365.25 day period exceeding state 24-hour PM 10 standard for each air quality subregion.
Data from SCAQMD annual air quality summary tables and CARB iADAM query tables. Data presented as percentages based on the days of data.

Percentage of daily samples taken over a 365.25 day period exceeding state 8-hour ozone standard (>0.07 PPM) for each air quality subregion.
Data from SCAQMD annual air quality summary tables and CARB iADAM query tables. Data presented as percentages based on the days of data.