	(1)	(2)	(3)	(4)	(5)	(6)
VARIABLES	spm	so2	no2	spm	so2	no2
						
						
Observations	9	9	9	19	19	19
5-Year Effect	23.64	-.47	-20.77***	-61.24***	1.41	-4.060
p-value	[.38]	[.88]	[00]	[.01]	[.62]	[.22]
Standard errors in parentheses						
*** p<0.01, ** p<0.05, * p<0.1						
