Find data and information the top global power plants. In the US, the correspondence is generally great between variations and trends in OMI NO2 levels and power plant NOx emissions reported to the Continuous Monitoring Emissions System (CEMS). However, there are many factors that can influence NO2 levels above a power plant, including changes in regional background levels, other nearby sources, etc. See Duncan et al. (2013) for a detailed discussion on this topic.