Moreover, the NO 2 pollution of most regions presented an increasing trend in these years, particularly the NCP region, Chengyu city-cluster, and Guanzhong city-cluster.
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Evaluation of China's Environmental Pressures Based on Satellite NO<sub>2</sub> Observation and the Extended STIRPAT Model.
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On the other hand, the PRD region showed a decreasing trend of NO 2 pollution.