Table 2.

Average mixing ratios with standard deviation, along with minimum (min) and maximum (max) values and the quantification frequency (QF) of the measured monoterpenes in ambient air. LOQ stands for limit of quantification. For values lower than the LOQ, mixing ratios equal to half of the LOQ were used to calculate the mean.

	Mean ± standard deviation (pptv)	Min (pptv)	Max (pptv)	QF (%)
α-pinene	11.7 ± 8.1	< LOQ	61.6	88
Camphene	< LOQ	< LOQ	21.9	11
Sabinene	< LOQ	< LOQ	34.2	11
p-cymene	2.0 ± 1.9	< LOQ	12.3	32
Limonene	< LOQ	< LOQ	2.9	<1