Why is it important to control particulate matter in a healthcare facility?

Most microbiological contamination is associated with non-viable airborne particles.

Not all hospital infections are transmitted by contact. A significant number of them, and often the most difficult to control, originate in the air we breathe.

Pathogens responsible for diseases such as tuberculosis, legionellosis or fungal infections such as Aspergillus are spread through bioaerosols: tiny particles of biological origin that can remain suspended in the air for long periods and travel great distances. In a closed environment with a high concentration of vulnerable people, such as a hospital, controlling these bioaerosols becomes an absolute priority.

The design and maintenance of ventilation and air conditioning (HVAC) systems are the first line of defence against airborne transmission. In critical areas, it is essential to have systems that not only renew the air, but also clean it effectively. This is achieved through the use of high-efficiency HEPA (High-Efficiency Particulate Air) filters, capable of retaining more than 99.97% of particles the size of microorganisms. In addition, differential pressure management is essential: infectious patient rooms must have negative pressure so that air does not escape, while operating theatres or immunocompromised rooms must have positive pressure so that outside air does not enter.

However, even the best facilities can fail. Therefore, continuous monitoring of air quality is an essential complement to good infrastructure. Measuring the concentration of airborne particles of different sizes in real time allows the bioaerosol load to be inferred and the correct functioning of HEPA filters to be evaluated.

Likewise, constant monitoring of pressure, humidity and temperature ensures that environmental conditions are optimal for minimising the survival and proliferation of pathogens. This active surveillance transforms air quality management from a passive process into a dynamic, real-time defence strategy against nosocomial infections.