Table 4.
Summary Statistics for Sulfate and Nitrate
Concentrations in Aerosols
Sampling Station
|
Analyte/Variable
|
Aerosol Particle Diameter
Classes
|
aN
|
bMean
|
cSE
|
| On
Site |
% Sulfate
|
dTSP
|
12
|
5.4 |
0.94 |
| |
% Nitrate
|
|
9
|
1.8 |
0.31 |
| |
Sulfate/Nitrate
Ratio
|
|
10
|
2.9 |
0.26 |
|
|
% Sulfate
|
ePM10
|
0
|
|
|
|
|
% Nitrate
|
|
0
|
|
|
|
|
Sulfate/Nitrate
Ratio
|
|
0
|
|
|
| |
% Sulfate
|
fPM2.5
|
0
|
|
|
| |
% Nitrate
|
|
0
|
|
|
| |
Sulfate/Nitrate
Ratio
|
|
0
|
|
|
|
Near
Field |
% Sulfate
|
TSP
|
22
|
10.3 |
1.3 |
|
|
% Nitrate
|
|
15
|
3.5 |
0.57 |
|
|
Sulfate/Nitrate
Ratio
|
|
15
|
4.0 |
0.74 |
| |
% Sulfate
|
PM10
|
18
|
11.7 |
1.7 |
| |
% Nitrate
|
|
14
|
2.3 |
0.31 |
| |
Sulfate/Nitrate
Ratio
|
|
14
|
8.1 |
3.0 |
|
|
% Sulfate
|
PM2.5
|
19
|
17.7 |
1.9 |
|
|
% Nitrate
|
|
10
|
2.1 |
0.48 |
|
|
Sulfate/Nitrate
Ratio
|
|
9
|
19.7 |
8.6 |
| Cactus
Flats |
% Sulfate
|
TSP
|
31
|
8.6 |
0.90 |
| |
% Nitrate
|
|
19
|
3.2 |
0.54 |
| |
Sulfate/Nitrate
Ratio
|
|
19
|
4.6 |
1.4 |
|
|
% Sulfate
|
PM10
|
20
|
9.9 |
1.5 |
|
|
% Nitrate
|
|
15
|
2.3 |
0.38 |
|
|
Sulfate/Nitrate
Ratio
|
|
15
|
7.8 |
3.3 |
| |
% Sulfate
|
PM2.5
|
14
|
19.0 |
2.6 |
| |
% Nitrate
|
|
8
|
1.9 |
0.5 |
| |
Sulfate/Nitrate
Ratio
|
|
8
|
20.8 |
7.8 |
aN = number
of samples above detection limit that were included in calculation of mean;
number in parenthesis is total number of samples analyzed
bMean = arithmetic mean
cSE = standard error
dTSP = total suspended particulate matter aerosols with aerodynamic diameter <75
µm
ePM10 = suspended particulate matter aerosols with aerodynamic diameter <10 µm
fPM2.5 = suspended particulate matter aerosols with aerodynamic diameter <2.5 µm
|
|
