Chromium and nickel concentration in roadside unwashed wine grapes and leaves is considered as a function of the distance from the suspected source, an isolated straight road. The analyses were performed with electrothermal atomization in a graphite furnace. The decrease in the concentration of the element can be described by means of a three‐parameter exponential functionc=A+ (B ‐ A)exp(‐ Cd)which allows the determination of the asymptotic level far from the emitting source (c8) and the pollution level (c0) at the edge of the road(d =0). Least‐squares nonlinear regression gives the estimation of the parametersA, Band C. The results indicate that an effect is detectable up to a distance of about 50 m.