Use "main exchange" in a sentence
1. The main exchange of air and pollution between the GB-PS airsheds is through the "portal" situated to the south of Haro Strait, extending from south of Bellingham westward to Port Angeles.
1. The main exchange of air and pollution between the GB-PS airsheds is through the "portal" situated to the south of Haro Strait, extending from south of Bellingham westward to Port Angeles.