Acrolein is used to control plants， algae， rodents and microorganisms. It is a clear liquid at room temperature， and it is toxic. It can cause inflammation and irritation of the skin， respiratory tract and mucous membranes， according to the US Centers for Disease Control and Prevention.
Wednesday is forecast to be the eighth day in a row that downtown L.A. hasn’t topped 60 degrees， a chilly streak not seen in the city since 2005.
