NAAQs Nonattainment and Maintenance areas

Description: These layers contains the nonattainment and maintenance areas (counties) in Texas. It was derived from the EPA’s Greenbook. A nonattainment designation means an area has not achieved compliance with the National Ambient Air Quality Standards (NAAQS). A maintenance designation means the area was formerly in nonattainment but has monitored attainment and is currently under a maintenance plan1. The U.S. Environmental Protection Agency (EPA) established the 8-Hour ozone NAAQS in 1997 and revised it with the 2008 and 2015 standards. The 1997 ozone NAAQS was revoked in April 6, 20152, along with the classifications, so the current maintenance designation is based on the approval of a maintenance plan by EPA for the region; rather than an official reclassification. These nonattainment counties were designated by the EPA based on their air quality monitoring data. Before it was revoked, there were 17 nonattainment counties for the 1997 ozone NAAQS: 8 counties in the Houston/ Galveston area (Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller); and 9 counties is the Dallas/Fort Worth area (Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, and Tarrant). There are 3 maintenance counties for the 1997 ozone NAAQS in the Beaumont/Port Arthur area (Hardin, Orange, Jefferson)3. There are 18 nonattainment counties for the 2008 ozone NAAQS: 8 counties in the Houston/ Galveston area (Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery, and Waller); and 10 counties in the Dallas/Fort Worth area (Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise)4. There are 16 nonattainment counties for the 2015 ozone NAAQS: 1 county in the San Antonio area (Bexar); 6 counties in the Houston/ Galveston area (Brazoria, Chamber, Fort Bend, Galveston, Harris, and Montgomery); and 9 in the Dallas/Fort Worth area (Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Tarrant, and Wise)5. The EPA established the NAAQS for particulate matter with a diameter of 10 micrometers or smaller (PM-10) in 1987. There is one nonattainment area for the 1987 PM-10 NAAQS: which is a portion of El Paso county6. The EPA established the NAAQS for carbon monoxide (CO) in 1971. There is one maintenance area for the 1971 CO NAAQS: which is a portion of El Paso county7. References: 1. United States Environmental Protection Agency, Frequent Questions about General Conformity; accessed 1 April 2021, <https://www.epa.gov/general-conformity/frequent-questions-about-general-conformity#86-523A-4466-AE04-09EAEF7C16F3%7D> 2. United States Environmental Protection Agency, Transportation Conformity Guidance for the South Coast II Court Decision, 2018 3. United States Environmental Protection Agency, Green Book 8-Hour Ozone (1997) Area Information - NAAQS Revoked; accessed 1 April 2021, <https://www.epa.gov/green-book/green-book-8-hour-ozone-1997-area-information-naaqs-revoked> 4. United States Environmental Protection Agency, Green Book 8-Hour Ozone (2008) Area Information, accessed 1 April 2021, <https://www.epa.gov/green-book/green-book-8-hour-ozone-2008-area-information> 5. United States Environmental Protection Agency, Green Book 8-Hour Ozone (2015) Area Information, accessed 1 April 2021, <https://www.epa.gov/green-book/green-book-8-hour-ozone-2015-area-information> 6. United States, Environmental Protection Agency, Green Book PM-10 (1987) Area Information, accessed 5 April 2021, <https://www.epa.gov/green-book/green-book-pm-10-1987-area-information> 7. United States, Environmental Protection Agency, Green Book Carbon Monoxide (1971) Area Information, accessed 6 April 2021, <https://www.epa.gov/green-book/green-book-carbon-monoxide-1971-area-information> Update Frequency: As needed. Source: Environmental Affairs Security Level: Public本数据集图层包含美国得克萨斯州未达标及维护区域（县级行政区），数据源自美国环境保护署（U.S. Environmental Protection Agency, EPA）的《绿皮书》（Greenbook）。未达标区域指未达到国家环境空气质量标准（National Ambient Air Quality Standards, NAAQS）的地区；维护区域指曾被归类为未达标区域，但经监测已符合空气质量要求，目前处于维护计划管控下的区域¹。 美国环境保护署于1997年制定8小时臭氧国家环境空气质量标准，并分别于2008年、2015年对该标准进行修订。1997年版臭氧NAAQS已于2015年4月6日被废止²，与其绑定的区域分类规则也同步取消，因此当前的维护区域认定并非基于官方重新分级，而是依据EPA对对应区域维护计划的审批结果执行。 ### 1997年版臭氧NAAQS相关区域 此前该标准下共有17个未达标县域：休斯顿/加尔维斯顿地区8个县（布拉佐里亚、钱伯斯、本德堡、加尔维斯顿、哈里斯、利伯蒂、蒙哥马利、沃勒），达拉斯/沃斯堡地区9个县（科林、达拉斯、登顿、埃利斯、约翰逊、考夫曼、帕克、罗克沃尔、塔兰特）；维护区域位于博蒙特/亚瑟港地区，共3个县（哈丁、奥兰治、杰斐逊）³。 ### 2008年版臭氧NAAQS相关区域 该标准下共有18个未达标县域：休斯顿/加尔维斯顿地区8个县（同上），达拉斯/沃斯堡地区新增怀斯县，共10个县（科林、达拉斯、登顿、埃利斯、约翰逊、考夫曼、帕克、罗克沃尔、塔兰特、怀斯）⁴。 ### 2015年版臭氧NAAQS相关区域 该标准下共有16个未达标县域：圣安东尼奥地区1个县（贝萨尔）；休斯顿/加尔维斯顿地区6个县（布拉佐里亚、钱伯斯、本德堡、加尔维斯顿、哈里斯、蒙哥马利，移除利伯蒂、沃勒两县）；达拉斯/沃斯堡地区9个县（科林、达拉斯、登顿、埃利斯、约翰逊、考夫曼、帕克、塔兰特、怀斯，移除罗克沃尔县）⁵。 ### 其他污染物标准相关区域 美国环境保护署于1987年制定直径10微米及以下颗粒物（particulate matter with a diameter of 10 micrometers or smaller, PM-10）的国家环境空气质量标准，该标准下的未达标区域为埃尔帕索县部分区域⁶。 美国环境保护署于1971年制定一氧化碳（carbon monoxide, CO）的国家环境空气质量标准，该标准下的维护区域为埃尔帕索县部分区域⁷。 ## 参考文献 1. 美国环境保护署. 通用合规常见问题解答[EB/OL]. 2021年4月1日访问. <https://www.epa.gov/general-conformity/frequent-questions-about-general-conformity#86-523A-4466-AE04-09EAEF7C16F3%7D> 2. 美国环境保护署. 南海岸II法院裁决运输合规指南[EB/OL]. 2018. 3. 美国环境保护署. 绿皮书：1997年版8小时臭氧区域信息——NAAQS已废止[EB/OL]. 2021年4月1日访问. <https://www.epa.gov/green-book/green-book-8-hour-ozone-1997-area-information-naaqs-revoked> 4. 美国环境保护署. 绿皮书：2008年版8小时臭氧区域信息[EB/OL]. 2021年4月1日访问. <https://www.epa.gov/green-book/green-book-8-hour-ozone-2008-area-information> 5. 美国环境保护署. 绿皮书：2015年版8小时臭氧区域信息[EB/OL]. 2021年4月1日访问. <https://www.epa.gov/green-book/green-book-8-hour-ozone-2015-area-information> 6. 美国环境保护署. 绿皮书：1987年版PM-10区域信息[EB/OL]. 2021年4月5日访问. <https://www.epa.gov/green-book/green-book-pm-10-1987-area-information> 7. 美国环境保护署. 绿皮书：1971年版一氧化碳区域信息[EB/OL]. 2021年4月6日访问. <https://www.epa.gov/green-book/green-book-carbon-monoxide-1971-area-information> ## 附加信息 更新频率：按需更新 来源：环境事务 安全级别：公开