Examlex
If an industry has exactly 10 firms with identical sales, the four-firm concentration ratio must be:
National Ambient Air Quality Standards
Standards established by the United States Environmental Protection Agency under the Clean Air Act that apply for outdoor air throughout the country.
EPA
The Environmental Protection Agency (EPA) is a U.S. federal agency responsible for protecting human health and the environment by enforcing regulations based on laws passed by Congress.
Clean Air Act
A federal law in the United States aimed at controlling air pollution on a national level by authorizing the Environmental Protection Agency (EPA) to establish standards for harmful pollutants.
National Ambient Air Quality Standards
Established by the United States Environmental Protection Agency to limit pollutants in the air to protect public health and the environment.
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