Time series of gaseous species from mobile laboratory on August 13, 2014. Time series plots of gaseous species measured from a mobile laboratory during period of high O₃ on August 13. Methane and ethane (a), CO and O₃(b), methane and ammonia (c), and methane and nitrous oxide (d). DOI: https://doi.org/10.1525/elementa.254.f14