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The National Emission Standards for Hazardous Air Pollutants Rule, effective from March 5, 2004, was introduced by the EPA to regulate pollutants emitted by stationary combustion turbines, specifically targeting Hazardous Air Pollutants like formaldehyde. This rule, found under 40 CFR 63 Subpart YYYY, set emission limits for eight turbine categories. Notably, it set a formaldehyde emission limit of ≤91 ppbv, excluding turbine startups. Turbines built or reconstructed before January 14, 2003, are exempt from these requirements.
However, after its introduction, the EPA paused most YYYY requirements, especially for major source turbines built after January 14, 2003, that use gas with limited oil-burning and specific combustion methods. On March 9, 2022, this pause was lifted, making the YYYY requirements active. Given the long hiatus, many facilities might be unfamiliar with these regulations. As per the rule, initial compliance tests should be done by September 5, 2022. Facilities uncertain about their turbine’s status under this rule should conduct an applicability analysis.