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The Regional Transportation Plans (RTP) is a long-term blueprint of a region’s transportation system.


Regional Transportation District (RTD) is a bus and rail transit system  in the Denver, Colorado, metropolitan area.


Relative Response Factor (RRF) is an analytical parameter used in chromatographic procedures to control impurities/degradants in drug substance and drug product. RRF is used to correct the difference in detector response of impurities with analyte peak.


The Rate of Progress (ROP) documents the control strategies a State is implementing to reduce emissions of ozone precursors.


The Reasonable Further Progress (RFP) Annual incremental reductions in air pollutant emissions as reflected in a State Implementation Plan that EPA deems sufficient to provide for the attainment of the applicable national ambient air quality standards by the statutory...


Reformulated Gasoline (RFG) is gasoline blended to burn more cleanly than conventional gasoline and to reduce smog-forming and toxic pollutants in the air we breathe.