Table 3.

Percent change in risk of ICD detected arrhythmias associated with each interquartile range (IQR) increase in mean air pollution in the 2 and 24 hours prior to arrhythmic event, adjusted for temperature and dew point.

	Hours Prior	IQR	% change	(95% CI)	p-value
24 Hour Moving Average
Particulates
PM2.5 (µg/m3)	24	5.0	14%	( −3% , 34% )	0.12
BC (µg/m3)	24	0.39	6%	( −10% , 26% )	0.47
PNC (1000/cm3)	24	8.4	12%	( −19% , 56% )	0.49
SO4 (µg/m3)	24	1.6	0%	( −14% , 15% )	0.96
Gases
NO2 (ppb)	24	7.3	8%	( −10% , 31% )	0.41
SO2 (ppb)	24	2.1	6%	( −13% , 29% )	0.54
O3 (ppb)	24	14.0	18%	( −12% , 56% )	0.27
2 Hour Moving Average
Particulates
PM2.5 (µg/m3)	2	6.0	26%	( 8% , 47% )	0.004 **
BC (µg/m3)	2	0.49	16%	( 2% , 32% )	0.021 *
PNC (1000/cm3)	2	10.9	24%	( −4% , 61% )	0.099
SO4 (µg/m3)	2	1.7	2%	( −10% , 16% )	0.71
Gases
NO2 (ppb)	2	10.0	18%	( −1% , 39% )	0.056
SO2 (ppb)	2	2.2	4%	( −10% , 20% )	0.59
O3 (ppb)	2	17.0	3%	( −20% , 31% )	0.83