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In a smallish room, body heat draws particles near, enhancing inhalation

Most models involving inhalation of particulates of various sorts (e.g., microbes, pollen, dust, toxins) assume a somewhat even distribution of the particulates in the air that is inhaled. While such an assumption helps to simplify exposure calculations, it is factually inaccurate in some circumstances...

NRDC challenge to EPA approval of California CAA SIP fails

California submitted a Clean Air Act State Implementation Plan to the EPA for approval. Pursuant to the "conformity rule" under 40 C.F.R. Section 93.118, the EPA conducted a review to determine whether the SIP's motor vehicle emissions budgets were adequate for transportation conformity...