CAMx simulation with on-road mobile and shipping NOx emissions adjusted to be in alignment with findings from using the MLR. On-road mobile NOx emissions were increased by a factor of 1.68, and shipping NOx emissions were decreased by multiplying by a factor of 0.77. Despite a large change to the on-road NOx, the total NOx emissions in the domain only increased by 8.6% from 373 to 405 tons per day (Table ). We chose not to adjust the railyards and airport sectors because combined they represent less than 3% of domain NOx emissions. We chose not to adjust the "other" sector or background / boundary NO2 since there is no straightforward modification for those contributions.