Primary and secondary air toxics from gasoline-alcohol transportation fuels

In this paper, we compare primary and secondary formation of air toxics and formation of ozone resulting from emissions from gasoline ana M85 (85% met hanol and 15% gasoline) fuelled vehicles using a photochemical model. Emiss ions from vehicles representing 1992 technology are taken from the CleanFle et demonstration program in the South Coast Air Basin of California, supple mented with data from the Auto/Oil Air Quality Improvement Research Program . The secondary formation of formaldehyde (H2CO), acetaldehyde (CH3CHO), an d peroxyacetyl nitrate (PAM), are based on model scenarios of an ozone epis ode in southern Ontario, Canada. Also, the results indicate that relative t o the gasoline scenarios, the M85 scenarios produce lower ambient concentra tions of ozone, CH3CHO, and PAN, and slightly higher concentrations of H-2 CO for several exposure metrics.