A company wishing to install a new source of air emissions in any county designated as non-attainment for ozone or particulate matter may not generate new emissions of the precursors of ozone or particulate matter (as applicable) unless those emissions are offset by a withdrawal from the emissions offset bank, through the clearinghouse established by the Ohio EPA for that purpose. The precursors of ozone are nitrogen oxides (NOx) and volatile organic compounds (VOC), and the precursors of particulate matter (when defined as "pm2.5," or the fraction smaller than 2.5 microns) are both the "primary" stack and fugitive emissions issuing directly from the source as particulate, and the gas or vapor species that give rise to "secondary" particulate matter as a result of condensation or chemical reaction in the atmosphere downwind of the source.

and so on . . . (must describe where the bank deposits come from, and who owns them. Also, among many other topics . . is there an exchange rate between VOC and NOx? How about between primary pm2.5 and gaseous precursor?)