Administrative law includes all law developed under the executive branch of government. The executive is made up of the head of state (President or governor), executive departments, and administrative agencies. The executive can make declarations that have the rule of law in the form of executive orders. These orders are usually based on existing statutory powers. The legislature cannot overturn these orders, but they can be reviewed by the judiciary via judicial review.
Independent agencies will often be created alongside a law that deals with a complicated issue so that the created agency can fulfill Congress's intended goal with the Act. Those agencies can later be given additional responsibilities dealing with their scope of law. Agencies and executive departments are given the power within the area of the law to create further rules and regulations to account for the details that Congress did not have when creating the law. These rules and regulations ensure that the law may be implemented and enforced properly. For example, the Clean Air Act requires the Environmental Protection Agency (EPA), based on current science, to establish national air quality standards for certain common and widespread pollutants. The EPA then developed and published its own regulations to categorize a wide-range of industrial pollutants as well as how much toxic air omissions must be reduced by.