Table 5.

Common mechanisms and effects observed in skin aging (↑) and in damage skin after air pollution exposition (▲).

Mechanisms		Biological effects		Effects on the skin
	Aging/pollutants		Aging/pollutants		Aging/pollutants
Activation of AhR	↑/▲	Increase of melanogenesis	↑/▲	Hyperpigmentation	↑/▲
Generation of ROS	↑/▲	DNA damage. Lipid peroxidation.	↑/▲	Wrinkles	↑/▲
Induction of inflammatory cascade	↑/▲	Decrease collagen	↑/▲	Delayed healing skin	↑/▲
Disruption of skin barrier	↑/▲	Increase MMPs	↑/▲	Dry skin	↑/▲
				Exacerbation of skin diseases	↑/▲