Spatial Variability and Application of Ratios between BTEX in Two Canadian Cities

Table 7

Ratios calculated using three nearby monitoring sites in Sarnia and NAPS data in Sarnia and Windsor.

	T/B	(m + p)/B	O/B	(m + p)/E	B : T : E : X
Sarnia
NAPS October 1	1.92	0.78	0.23	2.22	2.86 : 5.50 : 1 : 2.88
NAPS October 7	1.82	0.76	0.29	2.60	3.40 : 6.20 : 1 : 3.6
NAPS October 19	1.80	0.45	0.15	1.40	3.11 : 5.59 : 1 : 1.88
NAPS October 25	1.67	0.74	0.26	2.63	3.55 : 5.94 : 1 : 3.54
October 1, 7, & 19, 25  mean	1.80	0.68	0.23	2.21	3.23 : 5.81 : 1 : 2.98
Site 15	3.21	1.43	0.57	2.59	1.87 : 5.83 : 1 : 3.62
Site 16	2.53	1.00	0.41	2.42	2.42 : 6.11 : 1 : 3.42
Site 17	2.74	1.30	0.53	2.62	2.01 : 5.51 : 1 : 3.68
3 nearby sites mean	2.83	1.24	0.50	2.54	2.10 : 5.82 : 1 : 3.57
% Difference between NAPS and 37 sites
Median	60.4	102	139	22.0
Min	−20.7	−15.2	−2.56	−24.5
Max	154	312	377	39.0
Windsor
NAPS October 25	2.60	1.88	0.53	3.00	1.59 : 4.15 : 1 : 3.85
% Difference between NAPS and 42 sites
Median	32.4	−0.26	12.5	−7.64
Min	−45.3	−1.50	−56.9	−40.2
Max	163	0.82	78.4	3.07