Low Pollen Burden

Lower modeled tree, grass, and weed/ragweed pollen potential scores higher using climate, humidity, and ecoregion proxies.

Scale0-100

Higher values rank better for this score.

How It's Calculated

The latest published score is normalized to a 0-100 scale. The method below explains what the score rewards, with technical source metadata available for audit.

1
Tree burden blends season length, tree precipitation fit, annual dew point, tree temperature fit, dry-airborne persistence, low-snow rank, and ecoregion tree proxy, then applies a moisture gate.
2
Grass burden blends season length, broad and semi-arid precipitation fits, summer dew point, warm-season rank, dry-airborne persistence, low-snow rank, and ecoregion grass proxy, then applies a vegetation gate.
3
Weed/ragweed burden blends season length, warm-season rank, semi-arid and broad precipitation fits, summer dew point, dry-airborne persistence, low-snow rank, and ecoregion weed proxy, then applies a vegetation gate.
4
Overall burden is 32% tree, 34% grass, and 34% weed/ragweed, then inverse percentile-rank normalized over all scored places.

Technical details

Score TypeMaster Score

Read from the current master score table for this criterion.

Ranking BasisSingle Score

The top 10 below ignore your blended relocation weights and sort only by Low Pollen Burden.

No source details available for this score.

What This Score Means

Low Pollen Burden rewards places with lower modeled tree, grass, and weed/ragweed pollen potential from climate, humidity, and ecoregion proxies.

Statistics Feeding This Score

Modeled season length
Derived as 365 minus annual freezing days, capped to the 0-365 day range.
Source: Derived from NOAA annual normals
Temperature and precipitation fit
Bell-curve fit scores around vegetation-favorable annual temperature and precipitation targets.
Source: Derived from NOAA annual normals
Annual and summer dew point
Hourly-normal dew point signals used as moisture and growing-condition proxies.
Source: NOAA U.S. Climate Normals, hourly
Tree, grass, and weed burdens
Derived pre-normalized pollen-potential burdens before inverse percentile ranking.
Source: Derived from NOAA climate and humidity inputs
EPA ecoregion proxy
Level III ecoregion matched from the place point, used as a broad vegetation and ragweed-range proxy.
Source: EPA Level III Ecoregions

Source Data

Source: NOAA U.S. Climate Normals, annual/seasonalNOAA NCEI 1991-2020 station normals matched to places using nearby stations, with distance and elevation mismatch penalties.Source: NOAA U.S. Climate Normals, hourlyNOAA NCEI 1991-2020 hourly station normals used for dew point, muggy-hour, and heat-index humidity proxies.Source: EPA Level III EcoregionsEPA ecological-region polygons used as a regional vegetation and species-range proxy for pollen potential.

Known Limits

This is a modeled climate, humidity, and ecoregion pollen-potential proxy, not observed pollen counts.
EPA ecoregions are broad regional vegetation proxies, not parcel-level land cover or measured local plant abundance.
It does not yet include observed pollen stations, wind, mowing, urban canopy, exact tree species, exact ragweed stands, or local vegetation management.

Top 10 Locations

Ranked by Low Pollen Burden.

Loading top locations...