PSD · Prevention of Significant Deterioration
The permitting path a major new emitting source triggers in an attainment area, requiring best-available control technology and dispersion modeling — a year-plus schedule item.
Current numbers
~60 days-1 year+; case-specificair-permit lead time: minor-source 6-12 mo vs PSD/nonattainment NSR 18-36+ mo for combustion bridge power