Nitrogen Oxides

Nitrogen Oxides in the United States

Nitrogen Oxides (NOx) in Environmental Law

One of many combinations of nitrogen and oxygen. Nitrogen oxides are regulated under the Clean Air Act in provisions concerning both acid deposition and National Ambient Air Quality Standards. Uncontrolled emissions of nitrogen oxides, such as sulfur dioxide, can combine with water in the atmosphere to form acid rain. They also precede the formation of ozone at ground level and give smog its yellowish color. Nitrogen dioxide is one of the pollutants regulated under the National Ambient Air Quality Standards, but if an air quality control region is having difficulty with ozone, it must put additional controls on nitrogen oxides as well as volatile organic compounds.

The sources of nitrogen oxides are many: industry, boilers used in power plants, and internal combustion engines. Motor vehicles [see mobile sources] can be a major contributor to nitrogen oxide levels in a municipal area. See also nonattainment areas.
Based on “Environment and the Law. A Dictionary”.

Nitrogen Oxides: Open and Free Legal Research of US Law

Federal Primary Materials

The U.S. federal government system consists of executive, legislative, and judicial branches, each of which creates information that can be the subject of legal research about Nitrogen Oxides. This part provides references, in relation to Nitrogen Oxides, to the legislative process, the federal judiciary, and the primary sources of federal law (cases, statutes, and regulations).

Federal primary materials about Nitrogen Oxides by content types:

Laws and Regulations

US Constitution
Federal Statutory Codes and Legislation

Federal Case Law and Court Materials

U.S. Courts of Appeals
United States courts of appeals, inclouding bankruptcy courts and bankcruptcy appellate panels:

Federal Administrative Materials and Resources

Presidential Materials

Materials that emanate from the President’s lawmaking function include executive orders for officers in departments and agencies and proclamations for announcing ceremonial or commemorative policies. Presidential materials available include:

Executive Materials

Federal Legislative History Materials

Legislative history traces the legislative process of a particular bill (about Nitrogen Oxides and other subjects) for the main purpose of determining the legislators’ intent behind the enactment of a law to explain or clarify ambiguities in the language or the perceived meaning of that law (about Nitrogen Oxides or other topics), or locating the current status of a bill and monitoring its progress.

State Administrative Materials and Resources

State regulations are rules and procedures promulgated by state agencies (which may apply to Nitrogen Oxides and other topics); they are a binding source of law. In addition to promulgating regulations, state administrative boards and agencies often have judicial or quasi-judicial authority and may issue administrative decisions affecting Nitrogen Oxides. Finding these decisions can be challenging. In many cases, researchers about Nitrogen Oxides should check state agency web sites for their regulations, decisions, forms, and other information of interest.

State rules and regulations are found in codes of regulations and administrative codes (official compilation of all rules and regulations, organized by subject matter). Search here:

State opinions of the Attorney General (official written advisory opinions on issues of state law related to Nitrogen Oxides when formerly requested by a designated government officer):

Tools and Forms

Law in Other Regions

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