translate English to French: In asthmatics, pre-exposure to H2SO4 enhanced the decrements in FVC and FEV1 that occurred both immediately and 4 hours after O3 exposure (Frampton et al., 1995).
Chez les asthmatiques, la prÃ©-exposition au H2SO4 a immÃ©diatement favorisÃ© les diminutions de la CVF et du VEMS, ces effets ont aussi Ã©tÃ© observÃ©s quatre heures aprÃ¨s l'exposition Ã l'O3 (Frampton et al., 1995).