Frey, H., Adams, P., Adgate, J., Allen, G., Balmes, J., Boyle, K., Chow, J. C., Dockery, D., Felton, H., Gordon, T., Harkema, J., Kinney, P., Kleinman, M., McConnell, R., Poirot, R., Sarnat, J., Sheppard, L., Turpin, B., Wyzga, R. (2020). The need for a tighter particulate-matter air-quality standard, New England Journal of Medicine, 383 (7), 680-683. 10.1056/NEJMsb2011009