Will this allergy season be the Bay Area’s worst ever?

Spring has sprung after extended rains in the Bay Area. If you’re sneezing and wheezing, you’re in the company of a quarter of all adults and 20% of children in the U.S. who suffer from seasonal allergies, according to estimates from the Centers for Disease Control and Prevention.

Hay fever, or allergic rhinitis, brings itchy eyes, runny noses, sneezing, smelling difficulties, sore throats and skin irritation. The more severe allergic asthma can bring chest tightness, wheezing, shortness of breath...