关键词：大气；碳排放；空气污染
摘 要：The overarching purpose of this report is to present analysis of the 2008 NEI and comparison to previous years of inventory data, with a primary focus on the last full NEI - the 2005 NEI. We describe the national and regional patterns of CAP/HAP emission distributions in the 2008 NEI and which sources contribute to these releases. We do not assess nor predict the absolute risks to human health and ecosystems that may be associated with the presence of any of these specific air pollutants, but rather focus on the intensity of emission releases that may pose elevated risks. Pollutants of greatest interest include not only those that contribute to ozone and particle pollution, but also HAPs that are predicted by the 2005 NATA to be the most harmful to human health. To facilitate a more concise document, we have included just 27 pollutants in the report, which are listed in Table 1. Eight of these 27 pollutants are either CAPs or precursors to CAPs, and the remaining 19 are HAPs that were selected based on criteria that will be discussed later in this report.