Table 1.

SFs for afternoon emissions at BU and COP sites using NAM-HYSPLIT or WRF-STILT models for annual average (excluding summer) and each season

Season	BU HY	COP HY	All HY	BU WRF	COP WRF	All WRF
ANN	1.10	1.18	1.14 [+0.18,−0.16]	0.78	1.49	1.15 [+0.41,−0.30]
SON	1.27	1.30	1.29 [+0.26,−0.22]	0.75	1.34	1.05 [+0.47,−0.39]
DJF	1.03	1.04	1.04 [+0.19,−0.16]	0.62	1.43	1.01 [+0.60,−0.47]
MAM	1.01	1.19	1.11 [+0.38,−0.31]	1.01	1.74	1.36 [+0.81,−0.57]

“All” includes both BU and COP sites, and uncertainty is calculated using the bootstrap method; bracketed values represent 95% confidence intervals.