Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 19, issue 19
Articles | Volume 19, issue 19
https://doi.org/10.5194/acp-19-12587-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-19-12587-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 19
Research article
 | 
09 Oct 2019
Research article |  | 09 Oct 2019

Estimating background contributions and US anthropogenic enhancements to maximum ozone concentrations in the northern US

David D. Parrish and Christine A. Ennis

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Latest update: 08 Jun 2023
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Short summary
Background ozone transported into cities contributes greatly to urban concentrations. Based on projections of past trends, the largest ozone concentrations on which the 70 ppb National Ambient Air Quality Standard is based will reach that standard by ∼ 2021 in the New York City area but much later (∼ 2050) in the Los Angeles region. The much smaller background contribution in New York City (45.8 ± 1.7 ppb) than in Los Angeles (62.0 ± 2.0 ppb) is the primary reason for this large difference.
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