According to the Spatial Multimedia Compartmental Model (SMCM) predictions, elevated atmospheric formaldehyde concentrations may occur as a result of switching from conventional fuels to methanol fuel. Obviously, the degree of impact on urban, agricultural, and natural vegetation will depend on the pattern of exposure, concentration, and plant sensitivity. A complete analysis of the impact of formaldehyde on plant growth and development cannot be ascertained from the literature because of limited data and insufficient exposure scenarios. Both laboratory and field studies are needed to provide sufficient data for risk assessments. Vegetation research is needed to document the dose-response of plants to various formaldehyde concentrations and exposure patterns. Also, data on the exposure, fate and effects of formaldehyde in soils are needed to validate the SMCM prediction that the chemical will enter into the soil at high concentrations through wet deposition.