中文摘要：

对天津市2004-2008年环境空气中的NO2污染状况及变化趋势进行了系统分析,中心城区污染呈总体下降趋势,但仍是污染较重区域,滨海新区污染呈明显加重趋势。对主要污染源的排放分析表明,工业污染和汽车尾气污染为影响空气质量的主要因素,排放量分别占53.1%-67.6%和28.7%-44.0%。认为加大工业污染源NOX减排力度、实施严格的机动车排放标准和改善能源结构是控制NOX污染的重要措施。

英文摘要：

Analyzing the pollution status and the change trend of NO2 in Tianjin from 2004 to 2008, the pollution in the central city presented a descend trend, but it was still a polluted area; the pollution in Binhai New Area presented an aggravation trend. Through analyzing major NOx pollution resource, industry pollution and automobile exhaust were the main factors of influencing air quality, which takes 53.1% - 67.6% and 28.7% - 44.0% separately, To control NOx, the main measures and advice were to strictly control industry pollution source, implement motor vehicle let standard and improve energy frame.