Table 20 - Page 7
Ambient Air Quality Data for the
San Diego-Tijuana Area |
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COUNTY |
Ref |
Pollutant |
Unit. |
Yr |
No. of |
Arith. |
Std. |
Geom. |
Std. |
High |
2nd Hi |
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# |
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Obs. |
Mean |
Dev. |
Mean |
Dev. |
Read. |
Read. |
SD |
SD-8 |
S. Dioxide |
ppm |
91 |
8277 |
0.003 |
0.004 |
0.0016 |
2.58 |
0.04 |
0.03 |
SD |
SD-8 |
S. Dioxide |
ppm |
92 |
8131 |
0.0049 |
0.0048 |
0.0027 |
3.16 |
0.06 |
0.05 |
TJ |
SD-9 |
Lead |
ug/m3 |
94 |
29 |
0.044 |
0.037 |
0.031 |
2.27 |
0.14 |
0.12 |
TJ |
SD-9 |
Lead |
ug/m3 |
95 |
11 |
0.101 |
0.061 |
0.082 |
2.11 |
0.22 |
0.16 |
TJ |
SD-9 |
Lead |
ug/m3 |
96 |
30 |
0.049 |
0.039 |
0.036 |
2.23 |
0.15 |
0.14 |
TJ |
SD-9 |
PM-10 |
ug/m3 |
94 |
29 |
71.3 |
21.2 |
68.3 |
1.35 |
119 |
105 |
TJ |
SD-9 |
PM-10 |
ug/m3 |
96 |
40 |
54 |
27.2 |
49.7 |
1.47 |
190 |
88 |
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Source: US-Mexico Center on Air Pollution |
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County |
SD = San Diego; TJ = Tijuana |
Ref. # |
Refers to Air Monitor; see Table 17 for monitor numbers and locations |
Pollutant |
Pollutant measured |
Unit |
ppm = parts per million; ug/m3 = micrograms per cubic meter of air; |
Year |
Calendar year |
No. of Obs. |
Number of measurements taken at each monitor |
Arith. mean |
Arithmetic mean for hourly (daily for PM10 and Pb) of each pollutant measured |
Std. Dev. |
Standard deviation of arithmetic mean |
Geo. mean |
Geometric mean for hourly (daily for PM10 and Pb) of each pollutant measured |
Std. Dev. |
Standard deviation of geometric mean |
High Read. |
Highest pollutant hourly/daily readings |
2nd. H. Read |
Second highest pollutant hourly/daily readings |
Highest 95% |
pollutant concentration that 95% of the hourly/daily readings are equal
to or less than. |