Mphe lethathamo la metse e supileng e silafalitsoeng ka ho fetisisa Amerika
Ho latela American Lung Association, metse e 7 e silafetseng ka ho fetisisa e akarelletsa metse e 5 ea California. Lethathamo lena le latellana tjena, Los Angeles-Long Beach, Bakersfield, Visalia, Fresno-Madera-Hanford, Phoenix-Mesa, San Diego-Chula Vista-Carlsbad, le Denver-Aurora