Allergens changing in Missouri as summer ends

Fall is right around the corner, bringing milder temperatures and less humidity as people head outdoors. However, allergy sufferers will notice that the new season also brings a change in pollen and airborne allergens.

The most common allergens during summer in Central Missouri come from grasses and certain trees. Grass pollen usually remains high through August and starts to decline as fall begins.

Once grasses finish their pollen season, weeds take over. Nettles produce large amounts of pollen in June and July, continuing into early fall. Ragweed dominates in August and September, with lambsquarter (goosefoot) and goldenrod also appearing in the fall.

Pollen levels can vary significantly from year to year, season to season, and even day to day. Official pollen measurements are limited, as there are no pollen monitoring centers in Mid-Missouri. Pollen counts are collected in St. Louis and Kansas City and averaged across the area to estimate local pollen levels.

To check the pollen count in St. Louis, visit the website for the St. Louis Pollen and Mold Center. Kansas City Allergy and Asthma also tracks pollen levels for the other side of the state.

Remember, pollen apps and forecasts are often estimates for your area, so it’s best to consult an allergist for the most accurate health advice.