Gridded MDA8 surface ozone observations for the EU and US during 1993-2014

<p>Maximum daily eight-hour average (MDA8) surface ozone derived from gridded hourly observational datasets for the European and US domain [Schnell et al., 2014; 2015; Schnell and Prather, 2017], according to the MDA8 nomenclature of the European Union [EUR-LEX, 2008]. Note, we use a 358-day calendar, i.e. all months have 30 days except for February (28 days).</p> <p>EUR-LEX. (2008). Directive 2008/50/EC of the European parliament and of the council of 21 May 2008 on ambient air quality and cleaner air for Europe (2008/50/EC). Retrieved from https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32008L0050</p> <p>Schnell, J. L., Holmes, C. D., Jangam, A., Prather, M. J. (2014). Skill in forecasting extreme ozone pollution episodes with a global atmospheric chemistry model. Atmos Chem Phys, 14(15), 7721-7739. doi:10.5194/acp-14-7721-2014</p> <p>Schnell, J. L., Prather, M. J., Josse, B., Naik, V., Horowitz, L. W., Cameron-Smith, P., Bergmann, D., Zeng, G., Plummer, D. A., Sudo, K., Nagashima, T., Shindell, D. T., Faluvegi, G., Strode, S. A. (2015). Use of North American and European air quality networks to evaluate global chemistry&ndash;climate modeling of surface ozone. Atmos. Chem. Phys., 15(18), 10581-10596. doi:10.5194/acp-15-10581-2015</p> <p>Schnell, J. L., Prather, M. J. (2017). Co-occurrence of extremes in surface ozone, particulate matter, and temperature over eastern North America. Proceedings of the National Academy of Sciences, 114(11), 2854-2859. doi:10.1073/pnas.1614453114</p>