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Helmig, D., Blanchard B., and Hueber, J. (2018), Contrasting behavior of slow and fast photoreactive gases during the August 21, 2017, solar eclipse. Elem. Sci. Anth. 6, 1-13, doi: 10.1525/elementa.322... Asher E., Hills A.J., Hornbrook R.S., Shertz S., Gabbard S., Stephens B.B., Helmig D., and Apel E.C. (2021) Unpiloted aircraft system instrument for the rapid collection of whole air samples and measurements for environmental monitoring and air quality studies. Environ. Sci. Technol., doi:10.1021/acs.est.0c07213... Pollack I.B., Helmig D., O'Dell K., and Fischer E.V. (2021) Weekend-weekday implications and the impact of wildfire smoke on ozone and its precursors at Boulder Reservoir, Colorado between 2017 and 2019. J. Geophys. Res. 126, DOI: 10.1029/2021JD035221.