TY - JOUR A1 - Gang, R A1 - Jacob, D A1 - Shah, V A1 - Eastham, S A1 - Fritz, T A1 - Mickley, L A1 - Liu, T A1 - Wang, Y A1 - Wang, J T1 - Background nitrogen dioxide (NO2) over the United States and itsimplications for satellite observations and trends: effects of nitratephotolysis, aircraft, and open fires Y1 - 2023/06/07 N1 - R840014 JF - ATMOSTPHERIC CHEMISTRY AND PHYSICS VL - 23 IS - 11 SP - 6271 EP - 6284 ER -