Arizona Ozone Nonattainment Areas

This data set contains the 8-hour ozone nonattainment areas and information about its classification in Arizona. Information and geography data were obtained by the United States Environmental Protection Agency. The Clean Air Act, which was last amended in 1990, requires EPA to set National Ambient Air Quality Standards for six principal pollutants which can be harmful to public health and the environment. The Clean Air Act identifies two types of national ambient air quality standards. Primary standards provide public health protection, including protecting the health of "sensitive" populations such as asthmatics, children, and the elderly. Secondary standards provide public welfare protection, including protection against decreased visibility and damage to animals, crops, vegetation, and buildings. The nonattainment area status for the 8-Hour Ozone National Ambient Air Quality Standards (NAAQS) are areas that do not meet (or that contributes to ambient air quality in a nearby area that does not not meet) the national primary and secondary standards. Periodically, the standards are reviewed and sometimes may be revised, establishing new standards. This data is using the 2015 NAAQS Standards. For more information about the nonattainment standards, please visit the Green Book Data Download webpage. Last Updated: July 2023 Update Frequency: When Readily Available本数据集收录亚利桑那州境内8小时臭氧未达标区域及其分类相关信息。相关数据与地理信息均由美国环境保护署（United States Environmental Protection Agency）提供。于1990年完成最后一次修订的《清洁空气法案》要求该机构为六种对公众健康与环境存在危害的主要污染物制定国家环境空气质量标准（National Ambient Air Quality Standards, NAAQS）。该法案明确了两类国家环境空气质量标准：一级标准以保护公众健康为目标，涵盖哮喘患者、儿童、老年人等“敏感人群”的健康防护；二级标准以保护公共福利为目标，包括防止能见度降低，以及避免对动物、农作物、植被与建筑物造成损害。8小时臭氧国家环境空气质量标准（NAAQS）框架下的未达标区域，指那些自身未满足标准，或对邻近区域的环境空气质量造成影响并导致其未达标的区域。环境空气质量标准会定期审评，必要时予以修订并确立新版标准。本数据集采用2015版NAAQS标准。如需了解更多未达标标准相关信息，请访问《绿皮书》数据下载网页。最后更新时间：2023年7月；更新频率：随时可获取时更新。