Table 21
Ambient Air Quality Data for the Imperial
Valley-Mexicali Area |
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Ref |
Pollutant Name |
Units |
Yr |
No. of |
Arith |
Std. |
Geom. |
Std. |
High |
2nd Hi |
Highest |
# |
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Obs. |
Mean |
Dev. |
Mean |
Dev. |
Read. |
Read. |
95% |
IV-3 |
PM-10 |
ug/m3 |
91 |
54 |
63.1 |
33.3 |
56.6 |
1.61 |
229 |
137 |
134 |
IV-3 |
PM-10 |
ug/m3 |
92 |
60 |
47.3 |
18.9 |
43.7 |
1.51 |
103 |
88 |
80 |
IV-3 |
PM-10 |
ug/m3 |
93 |
61 |
52.4 |
27.8 |
47.2 |
1.58 |
175 |
162 |
98 |
IV-3 |
PM-10 |
ug/m3 |
94 |
57 |
51 |
24.5 |
46.5 |
1.53 |
126 |
126 |
123 |
IV-3 |
PM-10 |
ug/m3 |
95 |
59 |
45.4 |
21.3 |
40.8 |
1.61 |
122 |
89 |
83 |
IV-3 |
PM-10 |
ug/m3 |
96 |
41 |
48.7 |
37.6 |
42 |
1.65 |
257 |
100 |
71 |
IV-4 |
Carbon |
ppm |
94 |
4710 |
1.14 |
2.09 |
0.58 |
2.73 |
30.6 |
25.7 |
4.6 |
IV-4 |
Carbon |
ppm |
95 |
8289 |
1.22 |
2.32 |
0.59 |
2.83 |
32 |
29.8 |
4.9 |
IV-4 |
Carbon |
ppm |
96 |
6003 |
0.89 |
1.53 |
0.49 |
2.53 |
19.6 |
19 |
3.6 |
IV-4 |
Lead |
ug/m3 |
94 |
13 |
0.046 |
0.055 |
0.03 |
2.41 |
0.21 |
0.08 |
0.21 |
IV-4 |
Lead |
ug/m3 |
95 |
52 |
0.026 |
0.023 |
0.018 |
2.36 |
0.11 |
0.09 |
0.09 |
IV-4 |
Lead |
ug/m3 |
95 |
15 |
0.0293 |
0.0195 |
0.0227 |
2.22 |
0.075 |
0.05 |
0.075 |
IV-4 |
Lead |
ug/m3 |
96 |
28 |
0.025 |
0.02 |
0.019 |
2.19 |
0.07 |
0.07 |
0.07 |
IV-4 |
Lead |
ug/m3 |
96 |
19 |
0.0225 |
0.0178 |
0.016 |
2.63 |
0.08 |
0.042 |
0.08 |
IV-4 |
Nitrog |
ppm |
94 |
4770 |
0.0149 |
0.0161 |
0.009 |
2.73 |
0.227 |
0.151 |
0.048 |
IV-4 |
Nitrog |
ppm |
95 |
8334 |
0.0158 |
0.018 |
0.0054 |
8.26 |
0.217 |
0.186 |
0.051 |
IV-4 |
Nitrog |
ppm |
96 |
6241 |
0.012 |
0.0154 |
0.0025 |
12.57 |
0.164 |
0.135 |
0.045 |
IV-4 |
Ozone |
ppm |
94 |
4795 |
0.0574 |
0.0231 |
0.0529 |
1.51 |
0.125 |
0.12 |
0.106 |
IV-4 |
Ozone |
ppm |
95 |
8339 |
0.0616 |
0.0263 |
0.0572 |
1.46 |
0.232 |
0.205 |
0.112 |
IV-4 |
Ozone |
ppm |
96 |
6279 |
0.0664 |
0.0244 |
0.0623 |
1.43 |
0.159 |
0.146 |
0.112 |
IV-4 |
PM-10 |
ug/m3 |
94 |
15 |
115.7 |
50.4 |
106.8 |
1.51 |
258 |
153 |
258 |
IV-4 |
PM-10 |
ug/m3 |
95 |
56 |
65 |
35.4 |
55.7 |
1.79 |
180 |
149 |
142 |
IV-4 |
PM-10 |
ug/m3 |
96 |
31 |
42.8 |
18.5 |
39.1 |
1.55 |
83 |
80 |
80 |
IV-4 |
PM-10 |
ug/m3 |
96 |
41 |
61.3 |
33.3 |
52.9 |
1.76 |
159 |
143 |
130 |
IV-4 |
Sulfur |
ppm |
94 |
4052 |
0.0066 |
0.0053 |
0.0036 |
4.49 |
0.06 |
0.041 |
0.016 |
IV-4 |
Sulfur |
ppm |
95 |
4787 |
0.0052 |
0.005 |
0.0013 |
14.58 |
0.039 |
0.034 |
0.015 |
IV-4 |
Sulfur |
ppm |
96 |
5776 |
0.0029 |
0.0032 |
0.0012 |
7.46 |
0.036 |
0.032 |
0.009 |
IV-5 |
Ozone |
ppm |
91 |
1909 |
0.0527 |
0.0293 |
0.0473 |
1.56 |
0.18 |
0.17 |
0.12 |
IV-5 |
Ozone |
ppm |
92 |
7810 |
0.0671 |
0.0238 |
0.0632 |
1.42 |
0.15 |
0.15 |
0.12 |
IV-5 |
Ozone |
ppm |
93 |
7580 |
0.0696 |
0.0268 |
0.0628 |
1.76 |
0.21 |
0.15 |
0.12 |
IV-5 |
Ozone |
ppm |
94 |
6551 |
0.0776 |
0.0219 |
0.0747 |
1.32 |
0.18 |
0.15 |
0.12 |
IV-5 |
Ozone |
ppm |
95 |
6146 |
0.0651 |
0.028 |
0.0593 |
1.56 |
0.19 |
0.18 |
0.11 |
IV-5 |
PM-10 |
ug/m3 |
94 |
45 |
76.1 |
40.6 |
65.4 |
1.81 |
182 |
165 |
159 |
IV-5 |
PM-10 |
ug/m3 |
95 |
58 |
71.6 |
43.4 |
59.6 |
1.88 |
229 |
173 |
152 |
IV-5 |
PM-10 |
ug/m3 |
95 |
62 |
58 |
38.2 |
47.2 |
1.93 |
195 |
154 |
134 |
IV-5 |
PM-10 |
ug/m3 |
96 |
3 |
66 |
34.7 |
58.4 |
1.91 |
96 |
74 |
96 |
IV-5 |
PM-10 |
ug/m3 |
96 |
41 |
67.1 |
36.6 |
58.2 |
1.73 |
174 |
166 |
125 |
IV-6 |
Ozone |
ppm |
91 |
7619 |
0.0496 |
0.0192 |
0.0458 |
1.51 |
0.11 |
0.1 |
0.09 |
IV-6 |
Ozone |
ppm |
92 |
7966 |
0.0526 |
0.0217 |
0.0479 |
1.56 |
0.12 |
0.11 |
0.09 |
IV-6 |
Ozone |
ppm |
93 |
8527 |
0.0629 |
0.0203 |
0.0596 |
1.39 |
0.15 |
0.14 |
0.1 |
IV-6 |
Ozone |
ppm |
94 |
8384 |
0.062 |
0.0221 |
0.0579 |
1.46 |
0.13 |
0.12 |
0.1 |
IV-6 |
Ozone |
ppm |
95 |
7709 |
0.0601 |
0.0245 |
0.0555 |
1.51 |
0.15 |
0.14 |
0.11 |
IV-6 |
PM-10 |
ug/m3 |
91 |
62 |
56.6 |
32.1 |
50.3 |
1.63 |
243 |
112 |
97 |
IV-6 |
PM-10 |
ug/m3 |
92 |
46 |
41.4 |
14.7 |
38.5 |
1.5 |
80 |
69 |
60 |
IV-6 |
PM-10 |
ug/m3 |
93 |
59 |
46.5 |
25.2 |
41.3 |
1.63 |
166 |
119 |
92 |
IV-6 |
PM-10 |
ug/m3 |
94 |
57 |
45.3 |
21.4 |
40.3 |
1.67 |
119 |
105 |
86 |
IV-6 |
PM-10 |
ug/m3 |
95 |
54 |
31.2 |
18 |
26 |
1.91 |
78 |
76 |
71 |
IV-6 |
PM-10 |
ug/m3 |
95 |
60 |
41.5 |
21.6 |
36.7 |
1.66 |
130 |
92 |
75 |
IV-6 |
PM-10 |
ug/m3 |
96 |
41 |
49.2 |
54.6 |
38.1 |
1.9 |
359 |
110 |
98 |
IV-7 |
PM-10 |
ug/m3 |
94 |
25 |
43.2 |
21 |
39.5 |
1.52 |
120 |
73 |
73 |
IV-7 |
PM-10 |
ug/m3 |
95 |
60 |
38.8 |
19.1 |
34.5 |
1.65 |
107 |
79 |
72 |
IV-7 |
PM-10 |
ug/m3 |
96 |
40 |
49.1 |
34.8 |
42.1 |
1.7 |
229 |
90 |
88 |
IV-8 |
PM-10 |
ug/m3 |
94 |
28 |
60.5 |
27.6 |
54.5 |
1.6 |
126 |
103 |
103 |
IV-8 |
PM-10 |
ug/m3 |
95 |
58 |
63 |
29 |
57 |
1.58 |
168 |
133 |
122 |
IV-8 |
PM-10 |
ug/m3 |
96 |
37 |
77.5 |
47.4 |
68.4 |
1.6 |
280 |
192 |
192 |
IV-9 |
PM-10 |
ug/m3 |
91 |
13 |
48.8 |
55.1 |
37.4 |
1.88 |
229 |
56 |
229 |
IV-9 |
PM-10 |
ug/m3 |
92 |
13 |
28.5 |
16.2 |
24.1 |
1.87 |
60 |
50 |
60 |
IV-9 |
PM-10 |
ug/m3 |
93 |
13 |
25.2 |
9.2 |
23.5 |
1.5 |
37 |
36 |
37 |
IV-9 |
PM-10 |
ug/m3 |
96 |
11 |
73 |
70.3 |
59.2 |
1.78 |
282 |
72 |
282 |
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Source: US-Mexico Center on Air Pollution |
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County |
IV = Imperial Valley |
Ref. # |
Refers to Air Monitor; see Table 18 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. |