Researchers from Florida Atlantic University equipped public restrooms with particle counters to measure aerosol levels after flushing. The findings? A startling surge in airborne particles that underscores serious hygiene concerns.
During the early COVID-19 pandemic in June 2020, a Chinese study advised closing toilet lids before flushing, as it propelled droplets up to a meter away. Building on this, a peer-reviewed study from Florida Atlantic University, published in Physics of Fluids on March 22, 2021, examined public restrooms specifically. Public toilets often fall short on hygiene, making them unappealing—yet sometimes unavoidable in urgent situations.
The U.S. team deployed particle counters at various heights near urinals and standard toilets to quantify aerosols—those microscopic airborne particles—post-flush. Results showed a 209% increase in particles sized 0.5 to 1 micrometer, and a 69.5% rise for those between 0.3 and 0.5 micrometers.
The study urges quick exits after flushing. But why worry about these tiny droplets? Aerosols can carry infectious pathogens, amplifying risks during the COVID-19 era. While no confirmed toilet aerosol infections exist, the threat is real: coronavirus patients often suffer gastrointestinal symptoms like nausea, vomiting, and diarrhea, turning bodily fluids into transmission vectors. Poor ventilation in public restrooms exacerbates this.
Echoing the Chinese findings, experts recommend closing lids before flushing—though impossible for urinals. The safest approach? Avoid public restrooms when possible.
