“…Much research has been undertaken in an effort to better understand and quantify this effect (Lloyd et al, 1983;Chameides et al, 1988Chameides et al, ,1992Lopez et al, 1989;Atherton and Penner, 1990;MacKenzie et al, 1991;McKeen et al, 1991;Linet al, 1992). In addition to efforts to accurately determine anthropogenic emissions of NOx (NOx = NO + NO2) and VOCs, accurate estimates of BVOC fluxes are needed to fully understand the factors contributing to tropospheric ozone formation in both urban and remote areas (Roselle et al, 1991;Roselle 1994). Besides urban ozone air pollution the concurrently observed steady increase of background and rural tropospheric ozone concontrations (Altshuller and Lefohn, 1996) has also been reported to impact forest health and reduce agricultural crop yields (Manning and Krupa, 1992;Runeckles and Chevone, 1992;Chappelka and Chevone, 1992;Herstein et al, 1995).…”