William C. Taylor Jr., 48, associate professor of environmental science in the School of Engineering at Howard University, died Monday at Johns Hopkins University Hospital in Baltimore after a stroke.

On the Howard faculty since 1974, he also coordinated the environmental and water resources engineering program in the engineering school.

One of Dr. Taylor's outstanding accomplishments at Howard was the development of an air pollution research laboratory and a graduate program of study in that field.

Born in Sanford, N.C., he was a graduate of North Carolina A&T College, where he also received a master's degree in chemistry. He later earned a doctorate from the University of Connecticut.

Dr. Taylor worked for 17 years for Combustion Engineering, Inc., in Windsor, Conn., before coming to Howard. There he was supervisor of the material development laboratory and later of the Kreisinger development laboratory.

He had served with the Air Force in Japan and Okinawa in the late 1940s, and was with the Air Force Reserve.

The author of a number of publications, Dr. Taylor had contributed to books for the Atomic Energy Commission and the American Chemical Society.

He was a member of the Air Pollution Control Society and the American Chemical Society, and had served on several advisory boards to the U.S. Environmental Protection Agency.

Dr. Taylor participated actively in Urban League and Boy Scout programs. He had been active in the Presbyterian Church. Since coming here, he had been a member of the Good Hope Union United methodist Church in Silver Spring.

He is survived by his wife. Annette K., and two children. Cheryl Marie and William Charles III, of the home in Silver Spring, three sisters and three brothers.