Aerosol generated by playing wind instruments is less than that produced when vocalizing

Aerosol generated by playing woodwind and brass instruments is less than that produced when vocalizing (speaking and singing) and is no different than a person breathing, new research has found.

The findings, published online in the journal Aerosol Science and Technology, could be crucial to developing a roadmap for lifting COVID-19 restrictions in the performing arts, which have been significantly restricted since the start of the pandemic.

The research project, known as PERFORM (ParticulatE Respiratory Matter to InForm Guidance for the Safe Distancing of PerfOrmeRs in a COVID-19 PandeMic), was supported by Public Health England, the Department for Digital, Culture, Media and Sport (DCMS), and UKRI and was carried out by a collaborative team from Imperial College London, University of Bristol, Wexham Park Hospital, Lewisham and Greenwich NHS Trust and Royal Brompton Hospital.

The study looked at the amount of aerosols and droplets generated when playing woodwind and brass instruments compared with breathing and vocalization (speaking and singing). The work was carried out in an environment with no background aerosol particles to complicate measurement interpretation, with nine musicians playing 13 woodwind and brass instruments.

The research team found aerosol (<20 μm diameter) generated while playing woodwind and brass instruments is similar to that produced by breathing, based on measurements of several musicians playing the flute and piccolo as well measurements across a range of instruments including clarinet, trumpet, trombone, and tuba. Aerosol concentrations generated while instrument playing were lower than those associated with vocalizing at high volume.

Large droplets (>20 μm diameter) were not observed during instrument playing but were observed during singing and coughing. Together the findings indicate that playing woodwind and brass instruments generates less aerosol than vocalizing at high volume levels.

Concentrations of aerosol emissions from the musicians during breathing and vocalizing were consistent with results from a study carried out last year of a large group of professional singers. No difference was found between the aerosol concentrations generated by professional and amateur performers while breathing or vocalizing, suggesting aerosol generation is consistent across amateur and professional singers regardless of vocal training.

Our study found playing woodwind and brass instruments generates less aerosol than vocalization, which could have important policy implications in a roadmap to lifting COVID-19 restrictions, as many performing arts activities have been, and continue to be, severely restricted."

Dr Bryan Bzdek, Study Corresponding Author and Lecturer, School of Chemistry, University of Bristol

Jonathan Reid, Director of Bristol Aerosol Research Centre and Professor of Physical Chemistry in the School of Chemistry at the University of Bristol, added: "This study confirms that the risks of transmission of SARS-CoV-2 are likely elevated during vocalization at loud volume in poorly ventilated spaces. By comparison, playing wind instruments, like breathing, generates less particles that could carry the virus than speaking or singing."