Table 8.

Comparison of 12-hr average chemical concentrations from Logan, Utah between wind sectors.^a

Sectors	NO2	NO	NOx	NOy	NOz	O3	PM10	PM2.5	PM10-2.5
E-SE
E-NE					−0.5d		−4.0c	−2.9d
E-NW	−9.7d	−2.6c	−12.0d	−15.0d	−4.1d	14.3c	−22.5e	−12.7e	−6.9d
E-S	−18.1c	−22.6c	−39.4c	−54.2c	−13.7c	−16.2c	−78.5c	−51.6c	−22.1c
E-SW	−5.6c	−6.6c	−12.6c	−17.1d	−3.5e		−29.0d	−18.2d	−8.9d
E-W
E-N	−18.5d		−22.5d	−31.3d	−7.6d	21.1d	−45.2d	−29.5c	−11.3d
SE-NE
SE-NW
SE-S
SE-SW
SE-Wb	No test	No test	No test	No test	No test	No test	No test	No test	No test
SE-N
N-NW
N-S		−18.9c
N-SW						−14.7d
N-W
N-NE	15.7c	4.4c	20.5d	29.5d		−22.9d			10.8c
NW-S		−18.8d	−27.3c	−38.8d	−9.6d		−56.1c	−44.3c	−11.1c
NW-SW						−9.0c
NW-W
NW-NE	8.4c	4.3e	10.9e	13.4d		−16.9d
S-SW	11.3c					−9.7c
S-W
S-NE	17.2d	23.2d	38.1d	52.2c	13.2d	−18.8d	70.3c	48.9c	20.1c
W-SW
W-NE
NE-SW	−4.5c	−7.7e	−13.5c	−15.6d	−3.0c		−21.7c		−8.7d

Notes. The Hodges-Lehmann estimates of the magnitude of the differences are given as A – B, where A-B is the wind sector pair in the leftmost column. Units are ppb for trace gaseous species and μg/m³ for PM.

^aEmpty cells indicate no statistically significant difference (10% level).

^bNo comparison possible because there was only one observation for each wind direction.

^cStatistically significant difference (10% level).

^dStatistically significant difference (5% level).

^eStatistically significant difference (1% level).