Question

give an example of spm which can be used ​

Answer 1

Answer:

$\huge\underline\bold\red{AnSweR}$

Answer 2

Answer:

Salts in the form of nitrates, sulphates, carbonates, chlorides, etc. organic carbon compounds (PAHs, oxides, condensable organic compounds, etc. ) (called "organic carbon" are written as OC.) Trace elements such as heavy metals etc. , black carbon (BC).... soot also contains inorganic salts and metals.