Predictor
US ZIP (e.g. 10016)
About you
what's this?
Coronary Heart Disease (CHD) — narrowed heart arteries reduce blood flow. Heat stresses the heart; people with CHD are at higher risk of heat illness.
what's this?
Chronic Obstructive Pulmonary Disease (COPD) — long‑term lung disease (emphysema/chronic bronchitis) that makes breathing difficult. Heat and poor air quality can worsen symptoms.
what's this?
Extra body mass can make it harder to dissipate heat and may increase dehydration risk.
what's this?
Access to working AC reduces heat stress and is protective in heat events.
what's this?
Longer outdoor exposure raises heat load—especially in the afternoon. Hydration, shade, breaks, and adjusting timing help lower risk.
Result
Fill the form and click Predict.
Heat illness 101 (quick guide) - Composed by Philip Sun
Common types
- Heat exhaustion: heavy sweating, weakness, nausea, headache, dizziness; skin may feel cool/clammy.
- Heat stroke (medical emergency): body temp ≥ 104°F, hot/dry or profusely sweaty skin, confusion, fainting, seizures. Call 911, cool rapidly.
Who is at higher risk?
Older adults, infants, people with heart/lung disease (CHD, COPD, asthma), diabetes, obesity; outdoor workers/athletes; those without AC or who live alone.
Prevention basics
Hydrate often (avoid alcohol), schedule strenuous activity in the cooler morning/evening, take shade/AC breaks, wear light clothing, use fans/AC, check on vulnerable neighbors, and monitor forecasts/alerts.
When to seek help
If confusion, fainting, vomiting, or worsening symptoms occur—seek medical care immediately. Begin cooling (cool water, ice packs to neck/groin/armpits) while waiting for EMS.
Disclaimer
This tool provides an educational estimate of heat‑illness risk using population‑level data (HHI), weather forecasts, and your answers. It is not medical advice and is not a diagnosis. For personal medical concerns, consult a qualified clinician. Do not enter personal identifiers. By using this page you agree to use it at your own risk.