Dk. Giles et al., PESTICIDE INHALATION EXPOSURE, AIR CONCENTRATION, AND DROPLET SIZE SPECTRA FROM GREENHOUSE FOGGING, Transactions of the ASAE, 38(5), 1995, pp. 1321-1326
Fogger application of pesticide in greenhouses can reduce application
time and applicator contact with equipment. Since fog applications use
smaller and more concentrated droplets than typical wet spray applica
tions, potential for inhalation and off-target transport hazards may b
e increased. This study investigated temporal characteristics of airbo
rne pesticide after thermal fogging of a greenhouse. Droplet size spec
tra and concentration of airborne pesticide were measured. Volume medi
an diameter of the suspended aerosol decreased from 14 to 2.3 mu m dur
ing 1.5 h after application. Concentration of airborne pesticide decre
ased by 60% in the first hour after application and by 95% during 12 h
after application. Implications for respiratory exposure were analyti
cally developed from observed data.