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Rating

Low Tree Pollen

Scale55-100

Higher values are better.

About This Ranking

Goal

Highlight places with lower tree-pollen burden by blending month-balanced historical pollen counts with the approved canopy-, climate-, and station-calibrated model.

Sources

Data behind the rating

5 sources

USDA Forest Service Science Tree Canopy Cover

2025 CONUS and coastal Alaska; 2023 Hawaii and PR/USVI
Data
Modeled 30-meter percent tree-canopy cover sampled on a 5x5 grid within 6 km of the named community point.
What it tells us
Supplies local tree-presence context for pollen production. It measures canopy cover, not allergenic species, pollen release, landscaping, or transported pollen.
Data
NOAA NCEI 1991-2020 station normals matched to places using nearby stations, with distance and elevation mismatch penalties.
What it tells us
Provides typical annual heat, cold, precipitation, and snowfall conditions from nearby weather stations, not a block-level microclimate or future climate projection.
Data
NOAA NCEI 1991-2020 hourly station normals used to derive typical relative humidity, dew point, heat-index, and wind exposure at each place.
What it tells us
Provides typical hourly dampness, sticky-air, heat-index, and wind conditions from nearby stations, not indoor measurements, current weather, or a hyperlocal microclimate.

North American allergenic-pollen calendars

Station observations primarily 2003-2017
Data
Peer-reviewed daily pollen calendars and taxon shares from qualified National Allergy Bureau stations used to calibrate and validate the modeled tree-pollen index.
What it tells us
Grounds the model in observed station patterns, including short intense northern seasons; sparse station coverage does not make the resulting place estimates observed counts.
Data
EPA ecological-region polygons used as a regional vegetation and species-range proxy for pollen potential.
What it tells us
Supplies broad regional vegetation context for tree, grass, and weed/ragweed potential; it does not measure local plant abundance or pollen.

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