RT Journal Article SR Electronic T1 Origins of wintertime pollution JF Science JO Science FD American Association for the Advancement of Science SP 1412 OP 1413 DO 10.1126/science.363.6434.1412-g VO 363 IS 6434 A2 Ash, Caroline A2 Smith, Jesse A1 Smith, H. Jesse YR 2019 UL http://science.sciencemag.org/content/363/6434/1412.7.abstract AB