The good weather is settling in, and with longer evenings and higher temperatures, spring brings a less-welcome gift: allergies. ADVERTISEMENT ADVERTISEMENT Every year, millions of people swap sneezes from winter colds for sneezes from pollen. When spring arrives, trees begin their annual release of pollen, starting with hazel and alder, followed by birch, ash, and oak through spring, before grasses take over in the summer. Pollen allergy is triggered when the molecules in the air come into