Pollen counts drop in Houston, while mold rises slightly

Pollen Total:

• The overall pollen count decreased significantly from 134 units to 54 units.

• This represents a decrease of 80 units, equating to a 60% reduction.

Mold Total:

• The total mold count increased notably from 6734 units to 8156 units.

• This indicates an increase of 1422 units, which corresponds to a 21% rise.

Tree Species (Pollen):

• Carya (Hickory/Pecan):

  • Experienced a substantial decrease in pollen count from 72 units to 20 units (a decrease of 52 units or 72%).

• Other Tree Species (Combined):

  • Pollen counts for various other tree species showed decreases, with notable reductions in Mulberry (Morus), Pine (Pinaceae), Elm (Ulmus), and other unspecified tree species.

Weed Species (Pollen):

• Plantago (Plantain):

  • Observed a decrease in pollen count from 22 units to 16 units (a decrease of 6 units or 27%).

• Rumex (Sheep Sorel) and Other Weed Species:

  • Showed decreases in pollen counts, with Sheep Sorel (Rumex) going from 2 units to 0 units and other weed species collectively decreasing.

Mold Species:

• Basidiomycetes:

  • Exhibited a notable decrease in mold count from 1733 units to 668 units (a decrease of 1065 units or 61%).

• Cladosporium:

  • Showed a substantial increase in mold count from 1028 units to 3159 units (an increase of 2131 units or 207%).

• Penicillium/Aspergillus:

  • Experienced a significant decrease in mold count from 186 units to 20 units (a decrease of 166 units or 89%).

• Epicoccum:

  • Demonstrated an increase in mold count from 14 units to 30 units (an increase of 16 units or 114%).

Houston 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.