On May 30, 2003, EPA proposed to remove methyl ethyl ketone (MEK) from the HAP (Hazardous Air Pollutant) list.  They are taking comments for 60 days.

This could have a wide-ranging impact, since many coatings, inks, and thinning solvents contain MEK.  Any facilities that currently are major sources due to MEK emissions, could conceivably become non-major and, thus, not be subject to MACT Standards.