Having previously granted a public petition to add 1-bromopropane (1-BP) to the list of hazardous air pollutants (HAP) under the Clean Air Act (CAA), the U.S. Environmental Protection Agency (EPA) is soliciting information that will aid in addressing the impacts of the regulatory action. This is the first time that a substance will be added to the HAP list since the initial list was established by the 1990 CAA Amendments. The addition of 1-BP to the HAP list could have immediate regulatory compliance impacts to facilities that emit 1-BP. The EPA is soliciting data and information on 1-BP usage, emission controls, and costs to inform the process to address the implementation of the upcoming listing action and to ensure that the regulatory infrastructure is in place to effectively and efficiently control the emissions of 1-BP. The EPA is not soliciting comments on the decision that granted petitions to list 1-BP as a HAP and has not reopened that decision for comments.