Table 2.

Concentrations of air contaminants determined by stationary sampling during paving with hot mix asphalt (HMA) and warm mix asphalt (WMA).

	HMA				WMA				P-value (95 % CId)	GSD for the difference between HMA and WMA	Variance component within sampling positions	Variance component between sampling positions
	N  a	GMb	GSDc	Min–max	N	GM	GSD	Min–max
Organic carbon (mg m−3)	30	0.18	2.30	0.06–1.27	30	0.09	2.32	0.01–0.32	<0.01 (0.47–0.94)	1.86	0.44	0.39
Asphalt vapor (p.p.m.)	27	0.08	4.03	0.004–0.44	27	0.04	5.57	0.001–0.52	0.02 (0.12–1.26)	4.20	1.60	0.89
Respirable fraction of PMe (mg m−3)	15	0.22	2.43	0.05–1.12	15	0.12	2.83	<0.03f–0.36	0.04 (0.04–1.28)	3.06	1.03	0.08
Thoracic fraction of PM (mg m−3)	15	0.24	2.26	0.05- 1.06	15	0.17	2.04	0.06–0.37	0.16 (−0.16–0.88	2.56	0.71	0.03
Inhalable fraction of PM (mg m−3)	15	0.27	2.27	0.07– 1.21	15	0.23	1.89	0.06–0.44	0.4 (−0.27–0.65)	2.31	0.45	0.12

In each experiment, three parallel samples of each contaminant were collected. The statistical significance of differences in geometric means (GMs) was tested by performing a paired t-test on ln-transformed data. The variance between and within sampling positions were calculated using variance component analysis.

^aNumber of measurements.

^bGeometric mean.

^c Geometric standard deviation.

^dConfidence interval.

^eParticulate matter.

^fOne measurement was below the LOD.