My everyday geography connects New York City with the wider NYC–Westchester urban–suburban corridor. The corridor motivates the question; NYC is the analytical case because its individual-tree census and neighborhood data can be compared at one consistent scale.
This is not an allergy prediction or patient count. It is a reproducible way to ask how historical planting choices, mature trees, neighborhood conditions, and child population share overlap—and how a future corridor study could be designed.
The pattern is not simply “more disadvantage, more tree-pollen potential.” Large, mature, historically planted taxa shape the potential surface, while neighborhoods with a high share of children form a partly different geography.
London planetree (87,014 trees) and pin oak (53,185) are both NYC-priority taxa in this screen. Among the top quarter of Tracts by potential, 290 are in Brooklyn and 222 in Queens—over nine in ten of that group.
The 556 high-potential / high-child-share Tracts average 25.5% residents under 18 and concentrate in Brooklyn and Queens. The low-potential / high-child-share group averages 26.5% children and is especially concentrated in the Bronx.
These are Census Tract-level spatial associations with ATPI potential density. They generate hypotheses; they do not establish causes, personal exposure, or childhood allergy outcomes.
The strongest linear association. Older neighborhoods may retain larger, mature legacy trees, but housing age is a proxy—not the age of each tree.
Higher renter share corresponds to lower ATPI on average. The denominator is occupied housing units—not the percentage of individual residents who rent.
The relationship is also weakly negative. High tree-pollen source potential is not simply concentrated in the poorest tracts.
A weak positive relationship. It supports locating overlap, but not claiming that the tree pattern produced childhood allergy.
ATPI is more closely associated with older built environments than with composite vulnerability. Long-lived street trees preserve decisions made decades ago; present-day child and socioeconomic geographies have changed around them.
The evidence gives a partial answer. NYC considered health inequity when deciding where to expand trees and increasingly emphasized diversity and resilience. But pollen allergenicity—especially child-specific exposure—does not appear as an explicit systematic criterion in the official selection documents reviewed here.
A 2024 NYC study found that London planetree accounts for 34% of street-tree basal area and estimated 27.7 quadrillion pollen grains annually. The authors conclude that earlier municipal planting increased present-day Platanus pollen production.
The municipal forest report warned that London planetree, Norway maple, and Callery pear exceeded common dominance guidelines, emphasizing storms, pests, disease, and other stressors.
NYC Greenstreets identified low-canopy, high-asthma neighborhoods for planting. Yet its guidance emphasized large canopy, urban tolerance, and species diversity—not a low-allergen species rule.
NYC Parks considers season, site, location, utilities, form, and environmental tolerances. The published approved list does not present pollen allergenicity or child exposure as a selection field.
NYC’s policy history appears stronger on canopy expansion, asthma-related greening equity, survival, and resilience than on allergen-aware planting. That is not proof allergy was never discussed; it identifies a documented planning gap this project can test.
It changes the question from “Where is ATPI high?” to “Which response fits this place?” The categories are screening priorities for investigation and investment—not diagnoses.
Validate with seasonal pollen monitoring near schools and childcare; inventory nearby priority taxa; communicate during pollen periods; diversify replacement planting. Do not remove mature trees indiscriminately.
Maintain canopy benefits and use these areas as contextual comparisons. Continue surveillance rather than treating them as no-risk locations.
Focus on long-term urban-forest management: species diversification, succession planning, and measurement of actual pollen transport before intervention.
Tree pollen is not the leading signal. Direct child-health resources toward housing quality, mold, pests, traffic pollution, care access, and other allergy or asthma triggers.
Each page answers a different question, from individual trees to tract-level associations and decision-oriented quadrants.
Explore individual street trees, species, DBH, health, and allergen-evidence classes.
Open →02Move from a citywide potential surface to individual tree symbols; water-dominant Tracts are excluded.
Open →03Compare ATPI with housing, tenure, poverty, income, vulnerability, age, and HOLC history.
Open →04Map and plot the four combinations of ATPI potential and residents under age 18.
Open →The outcome is ln(1 + weighted individual-tree potential per land km²), aggregated to 2020 Census Tracts. The child variable is the ACS share of residents under 18. ATPI is a transparent screening index based on species evidence and DBH; it is not observed pollen concentration, personal exposure, allergy prevalence, or clinical risk. Street trees omit park and private-land trees.
Tree abundance alone does not equal allergy potential. The first analytical step classifies species by NYC-relevant pollen evidence, then combines that evidence with each tree's size.
A mature legacy species with direct NYC pollen-production evidence.
Oak is an important spring pollen group; count and mature size make pin oak a major contributor.
Evidence classes remain visible, but receive different weights.
ATPI means Allergenic Tree Pollen Index. It estimates relative source potential—not airborne concentration, personal exposure, allergy probability, or diagnosed disease.
Assign a documented evidence weight to each species class.
Use DBH to estimate basal area.
Sum potential in each tract and divide by land area.
Compare with neighborhood conditions and child share.
tree potential = evidence weight × ln(1 + basal area / 0.01)Tract outcome used in analysis: ln(1 + summed tree potential per land km²).
Children are not selected because they simply have “weak immunity.” Allergy is an immune response, not a general immune deficiency.
CDC identifies asthma as a leading chronic illness among children and a major cause of school absenteeism.
Schools and childcare sites create identifiable places for monitoring and action.
The map uses the share of residents under 18, not allergy cases.
The quadrants identify where direct pollen monitoring and child-health data would be most informative next.