This Funding Opportunity Announcement (FOA) establishes an accelerated review/award process to support research to understand health outcomes related to an unexpected and/or time-sensitive event (e.g., emergent environmental threat; pandemic; change in local, state, or national policy; natural disaster). Applications in response to this FOA must demonstrate that the research proposed is time-sensitive and must be initiated with minimum delay due to a limited window of opportunity to collect baseline data, answer key research questions, and/or prospectively evaluate a new policy or program. This FOA is intended to support opportunities in which empirical study could only be available through expedited review and funding, necessitating a substantially shorter process than the typical NIH grant review/award cycle. The time from submission to award is expected to occur within 4-5 months. However, administrative requirements and other unforeseen circumstances may delay issuance dates beyond that timeline.