March 17, Wednesday -- UC Davis professor emeritus and research scientist Tom Cahill will discuss air quality in the San Joaquin Valley at a public meeting in Fresno. His topic: "Round Up the 'Usual Suspects': Why We Are Losing the Air Quality War in the San Joaquin Valley." An international authority on air pollution, Cahill and other UC Davis scientists have conducted extensive studies of air pollution and related health effects in the valley. Sponsored by San Joaquin Valley Town Hall, Cahill's talk will begin at 10:30 a.m., after a casual coffee time from 9:30 to 10 a.m., at the William Saroyan Theatre in downtown Fresno. Tickets are $20; $1 students. More information: http://valleytownhall.com. Contact: Karin Temple, San Joaquin Valley Town Hall, (559) 444-2180, ktemple@managementpartners.com.