Smith, K., E. Atlas, E. Apel, D. R. Blake, G. Dutton, R. S. Hornbrook, S. Montzka, J. Muhle, and S. Schauffler (2024), 1 Chloromethanes in the North American troposphere 2 and lower stratosphere over the past two decades, Geophys. Res. Lett., doi:10.1029/2024GL108710 (submitted).