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3/2/2022 <br />3 <br />Air Quality Improvement Strategies <br />Strategy Result <br />Increase the number of healthy trees Increase pollution removal <br />Sustain existing tree cover Maintain pollution removal levels <br />Maximize use of low VOC‐emitting trees Reduces ozone and carbon monoxide formation <br />Sustain large, healthy trees Large trees have greatest per‐tree effects <br />Use long‐lived trees Reduce long‐term pollutant emissions from planting  <br />and removal <br />Use low maintenance trees Reduce pollutants emissions from maintenance  <br />activities <br />Reduce fossil fuel use in maintaining vegetation Reduce pollutant emissions <br />Plant trees in energy conserving locations Reduce pollutant emissions from power plants <br />Plant trees to shade parked cars Reduce vehicular VOC emissions <br />Supply ample water to vegetation Enhance pollution removal and temperature reduction <br />Plant trees in polluted or heavily populated areas Maximizes tree air quality benefits <br />Avoid pollutant‐sensitive species Improve tree health <br />Utilize evergreen trees for particulate matter Year‐round removal of particles <br />Oxygen Production <br />Oxygen production is one of the most commonly cited benefits of urban <br />trees. The annual oxygen production of a tree is directly related to the <br />amount of carbon sequestered by the tree, which is tied to the <br />accumulation of tree biomass.