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. 2015 Nov 10;6:8753. doi: 10.1038/ncomms9753

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Surface concentrations of NO₂ (p.p.b.v.) at an air quality monitoring station in El Centro, CA (CA Air Resources Board; obs) and modelled with WRF-Chem (mod) and WRF-Chem with soil NO₂ emission rates multiplied by 10 (mod*10) and 64.5 (mod*64.5). All data are from 23 to 29 September 2012. The dashed line represents the 1:1 relationship; all other lines correspond to linear regressions between modelled and observed data (default model r²=0.44, slope=1.4, intercept=0.14; mod*10 r²=0.44, slope=1.1, intercept=0.38; mod*64.5 r²=0.42, slope=0.5, intercept=0.7). All linear regressions were significant at P<0.0001.