This law's purpose is to maintain the purity of the air resources of the state to protect the health, general welfare and physical property of the people, maximum employment and the full industrial development of the state. The Air Conservation Commission in the Department of Natural Resources is authorized to provide for the abatement and control of air pollution by all practical and economically feasible methods. The Commission may adopt and enact relevant regulations, establish maximum quantities of air contaminants, and regulate equipment known to be a source of air emissions. The statutes of Missouri prevent the state from enacting regulations stricter than federal law. Air permits, when triggered based on level of regulated emissions, are required prior to the construction or operation of any air contaminant source in the state.