In this paper we prove the local existence and uniqueness of C
1+γ solutions of the Boussinesq equations with initial data υ0, θ0
, ∇θ0 ∈ Lq
for 0 < γ < 1 and 1 < q < 2. We also obtain a blow-up criterion for this local solutions. More precisely we show that the gradient of the passive scalar θ controls the breakdown of C1+γ
solutions of the Boussinesq equations.