Arizona PM10 Nonattainment Areas

This data set contains the PM-10 Nonattainment Areas in Arizona and its classification. It is intended to help provide the public with information to determine whether or not air quality within a given area is healthy. Data and geography was provided by the United States of Environmental Protection Agency (EPA). This data layer identifies areas in the U.S. where air pollution levels have not met the National Ambient Air Quality Standards (NAAQS) for 1990 PM-10 and have been designated "nonattainment". The EPA Office of Air Quality Planning and Standards (OAQPS) has set National Ambient Air Quality Standards for six principal pollutants, which are called "criteria" pollutants. Under provisions of the Clean Air Act, which is intended to improve the quality of the air we breathe, EPA sets limits on how much of a pollutant can be in the air anywhere in the United States. This ensures that all Americans have the same basic health and environmental protections. The law allows individual states to have stronger pollution controls, but states are not allowed to have weaker pollution controls than those set for the whole country. EPA calls these pollutants "criteria air pollutants" because the agency has regulated them by first developing health-based criteria (science-based guidelines) as the basis for setting permissible levels. One set of limits (primary standard) protects health; another set of limits (secondary standard) is intended to prevent environmental and property damage. A geographic area that meets or does better than the primary standard is called an attainment area; areas that don't meet the primary standard are called nonattainment areas. Data uses 1990 PM-10 NAAQS Standards. Last Updated: July 2023 Update Frequency: When Readily Available本数据集涵盖亚利桑那州的PM-10未达标区域及其分类，旨在为公众提供相关信息，以便其判断特定区域内的空气质量是否健康。本数据集的数据与地理信息由美利坚合众国环境保护署（United States of Environmental Protection Agency, EPA）提供。本数据图层可识别美国境内未达到1990年版PM-10国家环境空气质量标准（National Ambient Air Quality Standards, NAAQS），且被认定为“未达标区域”的区域。美国环境保护署空气与空气质量规划标准办公室（Office of Air Quality Planning and Standards, OAQPS）已针对六种主要污染物制定国家环境空气质量标准，这类污染物被称为“标准污染物”。根据旨在改善人类呼吸空气质量的《清洁空气法》相关条款，EPA为美国全境设定了空气中污染物的允许含量限值，以此保障全体美国民众均能享有同等的基本健康与环境保护权益。该法律允许各州实施更为严格的污染管控措施，但严禁各州制定低于联邦标准的污染管控要求。EPA将这类污染物称为“标准空气污染物”，因为该机构在对其开展监管工作时，首先制定了基于健康标准的准则（以科学为依据的指导方针），以此作为设定污染物允许浓度限值的基础。其中一套限值（一级标准）用于保护人体健康；另一套限值（二级标准）则旨在防范环境破坏与财产损失。符合一级标准或优于一级标准的地理区域被称为“达标区域”；未达到一级标准的区域则被称为“未达标区域”。本数据集采用1990年版PM-10国家环境空气质量标准。最后更新时间：2023年7月；更新频率：可随时获取时更新。