IMPROVED PM2.5 EMISSIONS FACTORS FOR NATURAL GAS-FIRED RICH-BURN RECIPROCATING ENGINES

摘要

New PM2.5 emission factors for 4-stroke engines are more robust than AP-42 1.Based on test methods and modern engines that are currently in use 1.1 2010 version of US EPA 201A-202 with best practices for reduced measurement bias 1.2OTM 37 stationary source dilution sampling method provides more accurate determination of PM2.S at low concentrations and consistency with mobile source applications 2.But...data sets remain small 3. 4S rich burn and 4S lean burn engines with and without catalyst emission controls are grouped together 3.1Data sets are currently too small to subcategonze further 4.Apply appropriate statistics for end use 4.1Average for air quality inventories and modelling 4.2A statistic allowing for variability (e.g., 99% UPL) for evaluating potential limits.