What is the maximum size of respirable particles that can be deeply breathed into the lungs?

Respirable particles are those small enough to be inhaled into the lungs, where they can potentially cause health issues. The maximum size of these particles that can typically be deeply breathed into the lungs is considered to be around 5 microns. Particles in this size range can penetrate the upper respiratory tract and reach the alveolar regions of the lungs, where gas exchange occurs.

Particles larger than 5 microns are generally filtered out by the body's natural defenses in the nose and throat, preventing them from reaching the deeper parts of the lungs. This understanding is critical for mold specialists and other professionals working with airborne contaminants, as effective respiratory protection and exposure assessments rely on knowing which particle sizes pose greater risks to health.

Understanding the implications of particle size is also essential in formulating strategies for ventilation, air cleaning, and other control measures in environments where mold and other allergens may be present. Recognizing the significance of 5 microns as a threshold assists professionals in identifying proper safeguards for those exposed to potential respiratory hazards.