All4 is a management consulting firm based in the United States, specializing in business services with a focus on corporate services. Established in 2001, the company has grown to employ between 201 and 500 individuals and reported a revenue of approximately $75.87 million. All4's expertise is particularly evident in the field of environmental compliance, as demonstrated by their published document concerning air permitting for data centers. This document outlines the complexities involved in the construction and air permitting processes for data centers, emphasizing the regulatory requirements that vary by state, with a particular focus on Pennsylvania. It discusses the importance of developing an air permit strategy, collaborating with regulatory agencies, and assessing environmental justice considerations. The document also highlights the need for careful evaluation of potential emissions from backup power sources, such as diesel generators, which are subject to federal and state regulations. Overall, All4 appears to be positioned as a knowledgeable resource in navigating the regulatory landscape associated with data center construction and environmental compliance.