The relative importance of the airborne route for several pathogens remains unclear.

Experimental facilities to study the survival and transport of airborne pathogens remain limited.

Standardized means of recovering viable pathogens from field samples of air are not available.

Phages may be used as surrogates for air decontamination study purposes and need to be further investigated.

Robust and efficient air decontamination strategies are not available and need to be developed and validated in small- and large-scale chambers.