*Particulate Matter and Human Health DOI: http://dx.doi.org/10.5772/intechopen.100550*

thought to contain secondary generated particles. There are several elements that are identified by researchers [32–34] based on locations and it is considered that the atmospheric PM elemental compositions are source based, **Table 3** (viz. Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, Se, Br, As, Rb, Sr., Y, Nb, Mo, Hg, Pb etc.). Also, it is noted that hydrogen ion is obviously included in PM components.
