What are the concerns about Peroxyacetyl nitrates (PANs)in the lower troposphere?

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Peroxyacetyl nitrates (PANs) are a family of air pollutants that can cause damage and reduce the growth of plants through their toxic effects on plant tissue. However, they do not appear to have significant health impacts on people. Their formation in the lower troposphere is primarily due to photochemical reactions involving volatile organic compounds (VOCs) and NOx emissions from human activities such as transportation and industrial activity. PANs are not formed by particulates such as dust, dirt, soot, and ash, nor are they principally related to sulfur dioxides or emitted directly from the tailpipes of automobiles.

What Are the Concerns About Peroxyacetyl Nitrates (PANs)in the Lower