Just inside the Hudson River tunnel, these smells seemed to blend together. Mr. Sunshine’s ears popped from the air pressure, and his face contorted with curiosity. The new-plastic smell was overwhelmed by an even more potent odor that he said he often eliminates from the basements of homes and schools.
— Odor mitigation expert Larry Sunshine rides the PATH train, in On PATH Trains, Noses Wrinkle at a Moldy Mystery at the New York Times. Hat tip to Jessica!