Saint Louis County Department of Health - Pollen and Mold Center 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: 5322 (Low) Mon, 09 Mar 2026 08:49:46 http://pollenandmold.stlouisco.com/Default.aspx http://pollenandmold.stlouisco.com/Default.aspx Air Quality for 3/9/2026: Not Monitored