关键词：空气污染；空气质量；技术支持文档建模；3级排放标准
摘 要：This Technical Support Document (TSD) describes the development of the emissions inventories used as inputs to the air quality modeling that the U.S. Environmental Protection Agency (EPA) performed to assess the impact of the proposed Tier 3 vehicle and fuel emission standards for cars and trucks. This document provides the details of emissions modeling done to support the development of the Regulatory Impact Assessment (RIA) for the Tier 3 Notice of Proposed Rulemaking (NPRM), hereafter referred to as the Tier 3 NPRM. The emissions inventories were generated using the Sparse Matrix Operator Kernel Emissions (SMOKE) modeling system version 2.7 and processed into the form required by the Community Multi-scale Air Quality (CMAQ) model. CMAQ simulates the numerous physical and chemical processes involved in the formation, transport, and destruction of ozone, particulate matter and air toxics.