Sulfur Dioxide and Emergency Department Visits for Stroke and Seizure

Table 1

	Mean value	SD	IQR
CO (in ppm)	0. 6	0.2	0.2
NO2 (in ppb)	16.8	4.6	6.2
SO2 (in ppb)	2.5	1.5	1.9
O3 (in ppb)	14.2	7.4	10.9