Table 2.

Comparison between NAPS and sampled BTEX data

	NAPS Dataa		Sampling Datab
	Monthly averagec	5 years averaged	2-week average
Benzene	1.93	1.40	1.07
Toluene	3.58	3.80	3.35
Ethylbenzene	0.64	0.57	0.56
(M+P) xylene	1.19	1.25	1.43
O-xylene	0.37	0.40	0.58
Total BTEX	7.71	7.25	7.19

^a Measured data at the National Air Pollution Surveillance (NAPS);

^b 2-week average data at 3 sampling points closest to the NAPS station;

^c The monthly average is the mean of the only 4 records available for October 2005;

^d 5 years average (2001 – 2005) concentration