Saint Louis County Department of Health - Pollen and Mold Center http://www.stlouisco.com/HealthandWellness Pollen and Mold Center. Saint Louis County, Missouri: Aeroallergen Reports Saturday Sunday 11 10 9 8 7 6 5 4 3 2 1 0 Mold Count: 10543 (Moderate) Tue, 21 May 2019 08:25:14 http://pollenandmold.stlouisco.com/Default.aspx http://pollenandmold.stlouisco.com/Default.aspx Air Quality for 5/21/2019: Yellow