Sequoia National Park (SNP) has the worst air pollution of any National Park in the United States. Ozone pollution levels in SNP are high enough to exert damaging impacts on humans, animals, and vegetation. The major source of ozone to SNP is local production within the nearby and ozone-polluted San Joaquin Valley (SJV), which is then transported out of the valley into the park. Emission controls to reduce ozone in the SJV have been in place for the last two decades and these controls should have had the effect of altering ozone levels within the SNP. This work has two aims: first, to investigate the chemistry driving trends in ozone in the SNP and to link these trends to trends in ozone in the SJV. Secondly, to consider both the metrics and time frames that best capture the ozone trends contributing to vegetation damage, as ozone damage to vegetation is not well represented by the trends in the primary ambient air quality standard assessed during ozone season.

Presentation Slides: https://www.scribd.com/document/321271565/Ozone-in-Sequoia-National-Park#fullscreen&from_embed