Tree pollen increases slightly, mold, weed, grass, effectively flat from Wednesday

Houston Pollen Changes:

• Tree pollen total increased by 30 units, representing a 52% rise from Apr 24 to Apr 25.

• Grass pollen total increased by 4 units, corresponding to a 40% rise from the previous day.

• Weed pollen total decreased by 2 units, showing a slight reduction of 6% from Apr 24.

Houston Mold Changes:

• Overall mold total decreased by 956 units, indicating a 12% reduction from the previous day.

Specific Species Changes:

• Among tree species:

  • Carya (Hickory/Pecan) pollen significantly increased by 52 units, showing a notable 260% rise.

  • Other Tree pollen increased by 2 units, representing a 50% increase.

  • Morus (Mulberry) pollen decreased by 6 units, showing a 100% reduction.

  • Pinaceae (Pine) pollen decreased by 6 units, representing a 75% reduction.

  • Quercus (Oak) pollen decreased by 12 units, reflecting a 75% reduction.

  • Salix (Willow) pollen decreased by 2 units, showing a 100% reduction.

  • Ulmus (Elm) pollen increased by 2 units, indicating no percentage change.

  • Other Tree pollen increased by 2 units, representing a 50% increase.

• Among weed species:

  • Plantago (Plantain) pollen decreased by 4 units, reflecting a 15% reduction.

  • Rumex (Sheep Sorel) pollen decreased by 2 units, showing a 50% reduction.

  • Other Weed pollen increased by 4 units, indicating a 100% rise.

• Among mold species:

  • Basidiomycetes mold significantly increased by 1175 units, representing a substantial 211% rise.

  • Cercospora mold increased by 42 units, showing a 420% rise.

  • Penicillium/Aspergillus mold increased by 81 units, reflecting a 77% rise.

  • Other mold species showed reductions (e.g., Cladosporium, Alternaria, and Oidium/Erysiphe) or remained unchanged (e.g., Rust, Curvularia).

Houston tree, grass pollen drop, as well as mold. Weed counts rise

Pollen Changes:

• Tree pollen total decreased by 98 units, representing a 63% reduction from Apr 23 to Apr 24.

• Grass pollen total decreased by 20 units, which corresponds to a 67% reduction from the previous day.

• Weed pollen total increased by 20 units, showing a substantial 143% rise compared to Apr 23.

Mold Changes:

• Overall mold total decreased slightly by 171 units, indicating a 2% reduction from the previous day.

Specific Species Changes:

• Among tree species:

  • Quercus (Oak) pollen decreased by 40 units, showing a 71% reduction.

  • Carya (Hickory/Pecan) pollen decreased by 18 units, indicating a 47% reduction.

  • Fraxinus (Ash) pollen decreased by 10 units, corresponding to an 83% reduction.

• Among weed species:

  • Plantago (Plantain) pollen increased by 20 units, demonstrating a notable 333% rise.

  • Rumex (Sheep Sorel) pollen increased by 2 units, representing a 100% increase.

• Among mold species:

  • Penicillium/Aspergillus mold decreased by 138 units, showing a 57% reduction.

  • Drechslera/Helminthosporium mold increased by 18 units, indicating a significant 300% rise.

  • Smuts/Myxomycete mold increased by 51 units, representing a 98% increase.

Houston tree pollen remains high while grass, weed, and mold decline

Tree total: 156 (6 more than April 22, 2024), with a day over day change of 4%.

• Grass total: 30 (-42 from April 22, 2024), a day over day change of -58%.

• Weed total: 14 (-18 from April 22, 2024), a day over day change of -56%.

• Tree, weed, grass pollen total: 200 (-54 from April 22, 2024), a day over day change of -21%.

• Mold total: 7861 (-2536 from April 22, 2024), a day over day change of -24%.

Tree species breakdown:

• Acer (Maple): 0

• Alnus (Alder): 0

• Betula (Birch): 0

• Carya (Hickory/Pecan): 38 (-6 from April 22, 2024), a day over day change of -14%.

• Celtis (Hackberry): 0

• Corylus (Hazelnut): 0

• Cupressaceae (Cedar): 2

• Fraxinus (Ash): 12 (-2 from April 22, 2024), a day over day change of -14%.

• Juglans (Walnut): 4 (-4 from April 22, 2024), a day over day change of -100%.

• Liquidambar (Sweet Gum): 0

• Morus (Mulberry): 16 (8 more than April 22, 2024), a day over day change of 100%.

• Pinaceae (Pine): 8 (6 more than April 22, 2024), a day over day change of 300%.

• Platanus (Sycamore): 0

• Populus (Cottonwood): 4 (2 more than April 22, 2024), a day over day change of 100%.

• Quercus (Oak): 56 (14 more than April 22, 2024), a day over day change of 33%.

• Salix (Willow): 2 (no change)

• Tilia (Linden): 0

• Ulmus (Elm): 0

• Other Tree: 18 (8 more than April 22, 2024), a day over day change of 80%.

Weed species breakdown:

• Ambrosia (Ragweed): 0

• Artemisia (Sage): 0

• Asteraceae (Aster): 0

• Cyperaceae (Sedge): 4 (no change)

• Plantago (Plantain): 6 (no change)

• Rumex (Sheep Sorel): 2 (-12 from April 22, 2024), a day over day change of -86%.

• Typha (Cattail): 0

• Urticaceae (Nettle): 0

• Chenopodiaceae/ Amaranthaceae (Amaranth): 2

• Other Weed: 0 (-8 from April 22, 2024), a day over day change of -100%.