{"id":355875,"date":"2016-04-04T11:04:32","date_gmt":"2016-04-04T16:04:32","guid":{"rendered":"https:\/\/content.findlaw-admin.com\/ability-law\/traffic\/drivers-license-vehicle-info\/state-emissions-standards-and-testing.html"},"modified":"2024-03-27T14:33:39","modified_gmt":"2024-03-27T19:33:39","slug":"state-emissions-standards-and-testing","status":"publish","type":"page","link":"https:\/\/www.findlaw.com\/traffic\/drivers-license-vehicle-info\/state-emissions-standards-and-testing.html","title":{"rendered":"Smog Laws by State"},"content":{"rendered":"\n
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Smog Laws by State<\/h1>\n
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\n By Natalie Moritz<\/a> | Legally reviewed by Melissa Bender, Esq.<\/a>\n | Last updated\n
\n \n <\/i>\n Legally Reviewed\n <\/summary>\n\n
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This article has been written and reviewed for legal accuracy, clarity, and style by FindLaw\u2019s team of legal writers and attorneys<\/a> and in accordance with our editorial standards<\/a>.<\/em><\/p>\n\n <\/div>\n <\/details>\n\n

\n \n <\/i>\n Fact-Checked\n <\/summary>\n\n
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The last updated date refers to the last time this article was reviewed by FindLaw or one of our contributing authors<\/a>. We make every effort to keep our articles updated. For information regarding a specific legal issue affecting you, please contact an attorney in your area<\/a>.<\/em><\/p>\n\n <\/div>\n <\/details>\n<\/section>\n

Most states require motorists to have their vehicle’s emission levels tested to ensure air pollution levels stay below a predetermined level. These statutes, or "smog laws," are in place to protect public health and the environment<\/a> by reducing pollutants that contribute to smog.<\/p>\r\n

In states with such requirements, you must submit proof that your vehicle meets emissions standards as part of your vehicle registration<\/a> renewal process.<\/p>\r\n

State Requirements and Standards for Testing<\/h2>\r\n

Every state has its process and standards for an acceptable pollution level from a vehicle. Sometimes, these regulations only apply to dense urban areas. For example, Missouri’s emissions standards<\/a> and inspection requirements apply only to the St. Louis Metropolitan Area.<\/p>\r\n

Certain vehicles are usually exempt from emissions testing requirements. Although this can vary by state, some of these exemptions include:<\/p>\r\n