Figure 4. EDS chemical analyses of particles collected on the filters from Table 1. A. SiO2, Al2O3, and CuO. B. MgO and CuO. C. Cl and CuO.

Figure 4. EDS chemical analyses of particles collected on the filters from Table 1. A. SiO₂, Al₂O₃, and CuO. B. MgO and CuO. C. Cl and CuO.