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: 15993 (High) Wed, 23 Apr 2025 10:05:14 http://pollenandmold.stlouisco.com/Default.aspx http://pollenandmold.stlouisco.com/Default.aspx Air Quality for 4/23/2025: Not Monitored