Houston Pollen and Mold Reports

Daily updated counts and reports for trees, weed, grass and mold are available in the above buttons.

Amer Ahmed Amer Ahmed

Mold remains heavy in Houston; pollen has moderated

Here's a summary of the changes for May 15, 2024, to May 16, 2024:

  • Tree Pollen: Decreased significantly from 44 to 8, showing a decline of 36 or -82%.

  • Grass Pollen: Decreased from 58 to 18, marking a decline of 40 or -69%.

  • Weed Pollen: Increased from 24 to 46, indicating a rise of 22 or 92%.

  • Total Pollen Count: Decreased from 126 to 72, showing a decline of 54 or -43%.

  • Total Mold Count: Increased from 15006 to 18152, marking a rise of 3146 or 21%.

Species Highlights:

  • Hickory/Pecan (Tree): Decreased from 18 to 6, showing a decline of 12 or -67%.

  • Hackberry (Tree): Decreased from 4 to 0.

  • Mulberry (Tree): Decreased from 12 to 0.

  • Pine (Tree): Decreased from 4 to 0.

  • Algae (Mold): Decreased from 40 to 20, marking a decline of 20 or -50%.

  • Alternaria (Mold): Slightly increased from 854 to 866, showing a rise of 12 or 1%.

  • Ascomycetes (Mold): Increased from 3871 to 4920, indicating a rise of 1049 or 27%.

  • Basidiomycetes (Mold): Decreased from 3286 to 1753, showing a decline of 1533 or -47%.

  • Cladosporium (Mold): Increased from 5937 to 9817, marking a rise of 3880 or 65%.

  • Curvularia (Mold): Decreased from 24 to 18, showing a decline of 6 or -25%.

  • Drechslera/Helmintho. (Mold): Decreased from 127 to 38, indicating a decline of 89 or -70%.

  • Epicoccum (Mold): Decreased from 62 to 14, showing a decline of 48 or -77%.

  • Nigrospora (Mold): Increased from 2 to 22, marking a rise of 20 or 1000%.

  • Oidium/Erysiphe(Powdery Mildew) (Mold): Increased from 8 to 14, showing a rise of 6 or 75%.

  • Penicillium/Aspergillus (Mold): Slightly increased from 283 to 320, indicating a rise of 37 or 13%.

  • Pithomyces (Mold): Decreased from 14 to 2, showing a decline of 12 or -86%.

  • Rust (Mold): Decreased from 12 to 6, marking a decline of 6 or -50%.

  • Stemphyllium (Mold): Decreased from 34 to 10, indicating a decline of 24 or -71%.

  • Torula (Mold): Increased from 0 to 18.

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Amer Ahmed Amer Ahmed

Grass and mold are both heavy; tree and weed pollen increase to medium levels


Here's a summary of the changes for May 14, 2024, to May 15, 2024:

  • Tree Pollen: Increased significantly from 2 to 44, showing a rise of 42 or 2100%.

  • Grass Pollen: Increased from 10 to 58, marking a gain of 48 or 480%.

  • Weed Pollen: Increased from 12 to 24, indicating a rise of 12 or 100%.

  • Total Pollen Count: Increased from 24 to 126, showing a significant rise of 102 or 425%.

  • Total Mold Count: Decreased from 16089 to 15006, marking a decline of 1083 or -7%.

Species Highlights:

  • Hickory/Pecan (Tree): Increased from 0 to 18, showing a rise of 18.

  • Mulberry (Tree): Increased from 0 to 12, indicating a gain of 12.

  • Pine (Tree): Increased from 2 to 4, marking a rise of 2 or 100%.

  • Plantain (Weed): Decreased from 6 to 0, showing a decline of 6 or -100%.

  • Alternaria (Mold): Increased from 26 to 854, indicating a significant gain of 828 or 3185%.

  • Ascomycetes (Mold): Decreased from 10072 to 3871, marking a decline of 6201 or -62%.

  • Basidiomycetes (Mold): Increased from 2010 to 3286, showing a rise of 1276 or 63%.

  • Cercospora (Mold): Increased from 44 to 357, indicating a significant gain of 313 or 711%.

  • Cladosporium (Mold): Increased from 3207 to 5937, marking a rise of 2730 or 85%.

  • Drechslera/Helmintho. (Mold): Increased from 2 to 127, showing a significant rise of 125 or 6250%.

  • Epicoccum (Mold): Increased from 2 to 62, indicating a gain of 60 or 3000%.

  • Pithomyces (Mold): Increased from 2 to 14, showing a rise of 12 or 600%.

  • Stemphyllium (Mold): Increased from 2 to 34, marking a gain of 32 or 1600%.

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Amer Ahmed Amer Ahmed

Mold almost doubles to heavy levels in Houston; pollen low

Here's a summary of the changes for May 13, 2024, to May 14, 2024:

  • Tree Pollen: No change, remaining at 2.

  • Grass Pollen: Increased from 6 to 10, showing a rise of 4 or 67%.

  • Weed Pollen: Increased from 6 to 12, indicating a gain of 6 or 100%.

  • Total Pollen Count: Increased from 14 to 24, showing a rise of 10 or 71%.

  • Total Mold Count: Increased significantly from 8236 to 16089, marking a gain of 7853 or 95%.

Species Highlights:

  • Plantain (Weed): Increased from 0 to 6, indicating a gain of 6.

  • Nettle (Weed): Decreased from 4 to 0, marking a decline of 4 or 100%.

  • Other Weed: Increased from 2 to 6, showing a rise of 4 or 200%.

  • Alternaria (Mold): Increased from 8 to 26, indicating a gain of 18 or 225%.

  • Ascomycetes (Mold): Increased from 5376 to 10072, marking a rise of 4696 or 87%.

  • Basidiomycetes (Mold): Increased from 1372 to 2010, showing a rise of 638 or 47%.

  • Cercospora (Mold): Increased from 0 to 44, indicating a gain of 44.

  • Cladosporium (Mold): Increased from 1002 to 3207, marking a significant rise of 2205 or 220%.

  • Penicillium/Aspergillus (Mold): Increased from 105 to 304, showing a rise of 199 or 190%.

  • Rust (Mold): Increased from 10 to 14, indicating a gain of 4 or 40%.

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