Infection Risk
30 students, moderate ventilation
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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended
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🏫 Classroom
30 students, moderate ventilation
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🍽️ Restaurant
Indoor dining, no masks while eating
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🏋️ Gym
Heavy breathing during exercise
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🌳 Outdoor Event
Festival or gathering outdoors
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🏢 Open Office
All-day desk work
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Enter Environment Details
0.34% Infection Risk
Low Risk Level
Risk Score: 2/5
Safe Distance
Max Gathering
Safe Duration
Required ACH
Ventilation
Interpretation
Based on the Wells-Riley model, with 20 people in a 200m³ space for 60 minutes, the estimated infection probability is 0.34%. This is considered low risk. Current conditions appear relatively safe.
Risk Over Time
Risk by Distance
Mitigation Effectiveness
Scenario Comparison
Recommendations
Increase mask usage from 50% to 80%+ for significant risk reduction
Improve ventilation: current 4 ACH is below recommended 6+ ACH
Increase distancing: move from 1.5m to at least 2m when possible
Move activities outdoors when feasible for 50x risk reduction
Add HEPA air purifiers for additional air cleaning
Environmental Adjustments
Wells-Riley Model Parameters
Quanta Rate
62.5 q/h
Concentration
0.024 q/m³
Inhaled Dose
0.007 q
Effective ACH
5.2
Model Limitations
- • Model assumes well-mixed air (may not apply in all spaces)
- • Does not account for short-range droplet transmission
- • Quanta emission varies significantly between individuals
- • Assumes steady-state conditions (not burst exposures)
Infection Risk
Low Risk | Safe Distance: 0.5m | Max Gathering: 151
For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
🏥 Health Facts
— WHO
— CDC
Understanding Airborne Transmission
The Wells-Riley equation models the probability of infection from airborne pathogens based on ventilation, exposure time, and emission rate. Understanding these factors helps optimize indoor safety.
Ventilation
Air changes per hour (ACH) dilute pathogens
Masks
Filter particles at source and receptor
Distance
Concentration decreases with distance
Duration
Risk accumulates over time
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