1. IEA Statistics (International Energy Agency, 2018); http://www.iea.org/statistics/
2. Massetti, E. et al. Environmental Quality and the US Power Sector: Air Quality, Water Quality, Land Use and Environmental Justice (Oak Ridge National Laboratory, 2017); https://www.energy.gov/sites/prod/files/2017/01/f34/Environment%20Baseline%20Vol.%202–Environmental%20Quality%20and%20the%20U.S.%20Power%20Sector–Air%20Quality%2C%20Water%20Quality%2C%20Land%20Use%2C%20and%20Environmental%20Justice.pdf
3. Toxic Air: The Case for Cleaning Up Coal-Fired Power Plants (American Lung Association, 2011); http://www.lung.org/assets/documents/healthy-air/toxic-air-report.pdf
4. Zheng, X.-Y et al. Association between air pollutants and asthma emergency room visits and hospital admissions in time series studies: a systematic review and meta-analysis. PLoS ONE 10, e0138146 (2015).
5. Orellano, P., Quaranta, N., Reynoso, J., Balbi, B. & Vasquez, J. Effect of outdoor air pollution on asthma exacerbations in children and adults: systematic review and multilevel meta-analysis. PLoS ONE 12, e0174050 (2017).