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Table 2 CAPs composition and ambient gaseous pollutants during 8-h exposure periods in Detroit and Grand Rapids

From: Divergent effects of urban particulate air pollution on allergic airway responses in experimental asthma: a comparison of field exposure studies

   Detroit Grand Rapids
CAPs mass μg/m3 542 519
Organic carbon μg/m3 177 280
Elementary carbon μg/m3 4 7
Sulfate μg/m3 216 58
Nitrate μg/m3 19 23
Ammonium μg/m3 48 51
Mg ng/mg3 580 770
Al ng/mg3 762 608
Ca ng/mg3 1557 2365
V ng/mg3 22 6
Mn ng/mg3 108 236
Fe ng/mg3 2760 3410
Ni ng/mg3 9 10
Cu ng/mg3 64 228
Zn ng/mg3 594 438
Se ng/mg3 141 61
Rb ng/mg3 3.4 4.2
Mo ng/mg3 4.6 5.2
Cd ng/mg3 2.3 1.9
Ba ng/mg3 7.0 25.1
La ng/mg3 2.0 1.1
Ce ng/mg3 3.0 3.7
Pb ng/mg3 107 49
Ambient gaseous pollutants
CO ppm 0.6 1.2
SO2 ppb 29 2
NO ppb 9 14
NO2 ppb 22 15