**By Ayurella Horn-Muller (Climate Central) and Kenton Gewecke (KOMU 8)** Asthmatics hit hard as pollen growing seasons get longer. This story was produced through a partnership between Climate Central and KOMU 8 in Columbia, MO. COLUMBIA - When Sherry Miller moved to Columbia from New Jersey, the heavy pollen in the air here triggered her asthma and sent her to the emergency room three times in a matter of months. In the 14 years since, she says the allergy issues she battles have gotten worse. “It's one of those things you just wish you could get rid of,” she said. Her once seasonal allergies are now affecting her year-round, and they’ve been intensifying — she’s always on antihistamines now, and has started having more frequent sinus infections, even during the winter. Miller says pollen is “everywhere.” “I find that it has become like a layer, that you can scrub all you want,” Miller said.…