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Updated ozone absorption cross section will reduce air quality compliance

机译：更新的臭氧吸收截面将降低空气质量合规性

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Photometric ozone measurements rely upon an accurate value of the ozone absorption cross section at 253.65 nm. This has recently been re-evaluated by Viallonet al. (2015) as 1.8 % smaller than the accepted value (Hearn, 1961) used for the preceding 50 years. Thus, ozone measurements that applied the older cross section systematically underestimate the amount of ozone in air. We correct the reported historical surface data from North America and Europe and find that this modest change in cross section has a significant impact on the number of locations that are out of compliance with air quality regulations if the air quality standards remain the same. We find 18, 23, and 20 % increases in the number of sites that are out of compliance with current US, Canadian, and European ozone air quality health standards for the year 2012. Should the new cross-section value be applied, it would impact attainment of air quality standards and compliance with relevant clean air acts, unless the air quality target values themselves were also changed proportionately. We draw attention to how a small change in gas metrology has a global impact on attainment and compliance with legal air quality standards. We suggest that further laboratory work to evaluate the new cross section is needed and suggest three possible technical and policy responses should the new cross section be adopted.
机译：光度臭氧测量取决于臭氧吸收截面在253.65 nm处的准确值。 Viallonet等人最近对此进行了重新评估。 （2015年）比前50年使用的可接受值（Hearn，1961年）小1.8％。因此，采用较旧横截面的臭氧测量系统地低估了空气中的臭氧量。我们更正了所报告的来自北美和欧洲的历史地面数据，并发现，如果空气质量标准保持不变，横截面的这种适度变化会对不符合空气质量法规的位置数量产生重大影响。我们发现，不符合美国，加拿大和欧洲现行的2012年臭氧空气质量健康标准的场所数量将增加18％，23％和20％。如果应用新的横截面值，它将除非空气质量目标值本身也按比例改变，否则将影响空气质量标准的实现和对相关清洁空气法案的遵守。我们提请注意气体计量的微小变化如何对达到和遵守法律空气质量标准产生全球性影响。我们建议需要进一步的实验室工作来评估新的横截面，并建议如果采用新的横截面，则应采取三种可能的技术和政策应对措施。

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