# Temperature-dependent emissions dominate aerosol and ozone formation in Los Angeles

“Temperature-dependent emissions dominate aerosol and ozone formation in Los Angeles” (2024), by Eva Y. Pfannerstill et al. Earth and Planetary Sciences research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: Eva Y. Pfannerstill, Caleb Arata, Qindan Zhu, Benjamin C. Schulze, Ryan X. Ward, Roy K. Woods, Colin Harkins, Rebecca H. Schwantes, John H. Seinfeld, Anthony Bucholtz et al.
- Published: June 20, 2024
- Field: Earth and Planetary Sciences
- DOI: https://doi.org/10.1126/science.adg8204
- Source: https://doi.org/10.1126/science.adg8204

## Abstract

Despite declines in transportation emissions, urban North America and Europe still face unhealthy air pollution levels. This has challenged conventional understanding of the sources of their volatile organic compound (VOC) precursors. Using airborne flux measurements to map emissions of a wide range of VOCs, we demonstrate that biogenic terpenoid emissions contribute ~60% of emitted VOC OH reactivity, ozone, and secondary organic aerosol formation potential in summertime Los Angeles and that this contribution strongly increases with temperature. This implies that control of nitrogen oxides is key to reducing ozone formation in Los Angeles. We also show some anthropogenic VOC emissions increase with temperature, which is an effect not represented in current inventories. Air pollution mitigation efforts must consider that climate warming will strongly change emission amounts and composition.

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