Table 1.

Summary of the correlation between modeled MD8O3 and the zero-out contribution of emissions from the US and east Asia.

	N	Emission impacts from the US	Emission impacts from east Asia
All CASTNET sites	2286	0.63***	−0:03
– Pacific Standard Time (PST)	238	0.52***	0.38**
– Mountain Standard Time (MST)	359	0.65***	0.36***
– Central Standard Time (CST)	489	0.55***	0.06
– Eastern Standard Time (EST)	1200	0.64***	−0:02
Elevated CASTNET sites	587	0.52***	0.22***

Note: significance levels by Student’s t test for correlation coefficients between observations and simulations are _{marked as}

^*p<0.05,

^**p<0.01, and

^***p<0.001, and lack of a mark indicates no significance.