PHOTOS 8 Dr. [Edward T. Naureckas], of the University of Chicago. Dr. [Kevin Weiss], of Northwestern University's Feinberg School of Medicine, was co-author of a 1990 study that first identified Chicago as having the highest mortality rate from asthma of any city in the United States [Nicole Henderson] and Rachel Henderson are 7-year-old twins who have suffered from asthma since infancy. Until recently they were on six breathing medications a day and their activities were severely restricted. After an allergist identified several allergy "triggers" that prompt them to have asthma attacks, the girls were able to discard all but one medication and add such activities as ice skating and gymnastics to their program. Dr. [John Jay Shannon], associate chief of respiratory and critical care medicine at John Stroger Jr. Hospital of Cook County, relaxes with staff in between seeing asthma patients. More than 8,000 of them come to [Stroger]'s ER each year. [Victoria Seals], 31, take asthma medication twice daily and (lower right) she must chart the volume of her breathing using a "peak flow" meter. Tribune photos by Chris Walker Twins Rachel and Nicole Henderson, 7, enjoy a couple of hot dogs on the way to the ice rink. Their well-managed asthma lets them enjoy activities they would have had to avoid years ago. Tribune photo of the Henderson twins by Chris Walker. (Magazine, Page 2.) (A chain wrapped tightly around a balloon, squeezing it.) On the cover: Photo illustration by Fredrik Broden. ADULTS WITH ASTHMA. The Chicago Asthma Atlas is a series of maps that display, by zip codes, the prevalence of asthma and treatment patterns in the city. This map shows the distribution of adult asthma, and how it congregates in black communities.