Table 8.

Alternative specifications .

	Cases		Deaths
	(1)	(2)	(3)	(4)
Weighted PM 2.5	0.00968*	0.0589**	0.00468**	−0.000800
	(0.00495)	(0.0260)	(0.00211)	(0.000770)
F Stat	14.28		14.28
Dep Var Mean	1.675	7.875	0.152	0.216
Pct change mean	0.968	0.748	0.468	−0.371
Controls	✓	✓	✓	✓
County & State-by-week FEs	✓	✓	✓	✓
Inverse hyperbolic sine	✓		✓
Ordinary least squares		✓		✓
Observations	97 885	97 885	97 885	97 885

${}^{\ast }$$p<0.1$, ${}^{\ast \ast }$$p<0.05$, ${}^{\ast \ast \ast }$$p<0.01$. Standard errors clustered at the county level in parentheses. Controls include state-level and county-level policy adoption, wind speed, minimum and maximum daily temperature, precipitation, prior two-week social distancing behavior, day-of-week, and two lagged wind direction-by-monitor cluster interactions. All regressions include county and state-by-week fixed effects. Displayed output of alternative modeling specifications. Columns (1) and (3) apply the inverse hyperbolic sine transformation to the incidence of cases or deaths. Columns (2) and (4) present the results of an Ordinary Least Squares estimation procedure instead of the two-stage least squares model.