They are old dorms not updated from decades obvious they were gonna get mold. It is a great engineering school but not the best compared to others like Michigan etc. If you really like Maryland maybe get an apartment for your son which is offered by the uni for a higher price. Two kids died in the span of 2 years at Maryland because of poor treatment. 40 people hospitalized because of the adenovirus virus. Recently someone threatened to shoot up the school now in custody a few days ago. Your and your sons choice if you can handle situations like this.