Anthropogenic activities biomass combustion

Polycyclic aromatic hydrocarbons (PAHs, sometimes also called polynuclear aromatics, PNA) are a hazardous class of widespread pollutants. The parent structures of the common PAHs are shown in Fig. 4 and the alkylated homologs are generally minor in combustion emissions. PAHs are produced by all natural combustion processes (e.g., wild fires) and from anthropogenic activity such as fossil fuels combustion, biomass burning, chemical manufacturing, petroleum refining, metallurgical processes, coal utilization, tar production, etc. [6,9,15,18, 20,24,131-139]. 

HCHO and HCOOH are important indoor corrosion stimulants that can originate from tobacco smoke, combustion of biomass, adhesives, and plastics. In general, the concentration of these stimulants is lower indoors than outdoors, except for ammonia and the organic species, which usually have a higher concentration indoors than outdoors. This higher level is the result of anthropogenic activity. 

Anthropogenic carbon The additional carbon that has been released to the environment over the last several centuries by human activities including fossil-fuel combustion, agriculture, forestry, and biomass burning. 

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