Table 1.

The model simulation settings for the 2017 fire smoke case study over the PNW region.

Settings	CTRL	SENS
Period	08/13-09/14/2017 1	08/13-09/14/2017 1
Resolution	Horizontal: 4 km Vertical: 37 layers	Horizontal: 4 km Vertical: 37 layers
Meteorology	WRFv3.7 [27]	WRFv3.7 [27]
Chemistry	CMAQv5.2 [28] with cb05e51_ae6_aq	CMAQv5.2 [28] with cb05e51_ae6_aq
Fire emission	None	BlueSky [12]
Non-fire emissions 2	NEI2014 [32]	NEI2014 [32]
Initial/Boundary conditions	Prescribed concentrations	Prescribed concentrations

¹ The first two-day model runs are for spin-up only and discarded for model evaluation. ² non-fire emissions include both anthropogenic sources from power plants, industries, traffic, etc., and natural sources such as dust, sea salt, and biogenic emissions. PNW: Pacific Northwest; CTRL: control experiment; SENS: sensitivity experiment.