Definition

Particles in the atmosphere that have diameters generally less than 0.1 micrometer (μm). UFP are created by
combustion processes and chemical reactions in the atmosphere.

Definition and Description

Ultra-fine particles, often abbreviated as UFPs, are a category of airborne particulate matter that consists of very tiny solid or liquid particles suspended in the air. These particles are characterized by their extremely small size, typically measuring less than 0.1 micrometers (µm) in diameter. Ultra-fine particles are a subject of ongoing research and monitoring, as understanding their sources, behavior, and effects is essential for addressing air quality and public health concerns.