Detailed pollen and mold reports for Houston Texas. Pollen and mold spore counts are made available Monday through Friday, except for City of Houston holidays.

Houston Texas Pollen and Mold Counts (October 4, 2024, to October 8, 2024)

Pollen:

• Houston Texas Tree Pollen: Dropped significantly from 24 to 6 (-18, -75%), with a major decline in Ulmus (Elm) and Other Tree.
• Houston Texas Grass Pollen: Plummeted from 30 to 4 (-26, -87%).
• Houston Texas Weed Pollen: Decreased from 665 to 548 (-117, -18%), primarily driven by declines in Ambrosia (Ragweed) and Artemisia (Sage).

Mold:

• Total Mold: Decreased from 18,786 to 16,497 (-2,289, -12%), with significant reductions in Basidiomycetes, Cercospora, and Cladosporium, although Ascomycetes saw a slight increase.

Detailed Changes:

Tree Pollen:

• Ulmus (Elm): Dropped by 16 (from 22 to 6).
• Other Tree: Decreased by 2 (from 2 to 0).

Grass Pollen:

• Decreased by 26 (from 30 to 4).

Weed Pollen:

• Ambrosia (Ragweed): Decreased by 111 (from 645 to 534).
• Artemisia (Sage): Decreased by 2 (from 8 to 6).
• Cyperaceae (Sedge): Decreased by 4 (from 4 to 0).
• Chenopodiaceae/Amaranthaceae (Amaranth): Decreased by 4 (from 4 to 0).
• Other Weed: Increased by 4 (from 4 to 8).

Mold:

• Algae: Remained at 0.
• Alternaria: Dropped sharply by 294 (from 372 to 78).
• Ascomycetes: Increased by 413 (from 3,377 to 3,790).
• Basidiomycetes: Decreased by 920 (from 2,685 to 1,765).
• Cercospora: Decreased by 425 (from 882 to 457).
• Cladosporium: Decreased by 636 (from 9,505 to 8,869).
• Curvularia: Decreased by 106 (from 253 to 147).
• Drechslera/Helminthosporium: Decreased by 18 (from 64 to 46).
• Epicoccum: Decreased by 12 (from 36 to 24).
• Nigrospora: Decreased by 4 (from 34 to 30).
• Oidium/Erysiphe (Powdery Mildew): Decreased by 2 (from 8 to 6).
• Penicillium/Aspergillus: Increased by 28 (from 571 to 599).
• Periconia: Increased slightly by 5 (from 159 to 164).
• Pithomyces: Increased by 2 (from 20 to 22).
• Rust: Increased by 4 (from 16 to 20).
• Smuts/Myxomycete: Decreased by 253 (from 716 to 463).
• Spegazinia: Decreased by 2 (from 4 to 2).
• Stemphyllium: Decreased by 10 (from 22 to 12).
• Tetraploa: Decreased by 14 (from 14 to 0).
• Torula: Decreased significantly by 45 (from 48 to 3).

Summary:

• Houston Texas Pollen: Overall pollen counts declined sharply, with significant drops in Tree Pollen, Grass Pollen, and Weed Pollen, especially in Ulmus (Elm) and Ambrosia (Ragweed).
• Houston Texas Mold: Mold levels also saw a notable decline, driven by drops in Basidiomycetes, Cercospora, and Cladosporium, though Ascomycetes and a few others increased slightly.