Chalk dust particles typically range in diameter from 5 μm to 100 μm.
Chalk powder, often referred to as chalk dust when airborne, consists of tiny particles with varying sizes. Based on research, the size range of these particles is known to be between 5 micrometers (μm) and 100 micrometers (μm) [24]. This indicates that chalk dust is not a uniform substance but comprises particles across a spectrum of sizes within this range.
Understanding the size of chalk dust particles is relevant in various contexts, particularly concerning air quality and health impacts. Particles within this size range can become airborne and behave differently depending on their specific diameter. For instance, smaller particles might remain suspended in the air for longer periods. The provided reference also highlights the broader context of increasing air pollution and its health implications, suggesting why understanding the size of airborne particles like chalk dust is important.
To visualize the typical size range:
- Minimum Diameter: 5 μm
- Maximum Diameter: 100 μm
This range covers particles that are generally larger than those considered "fine" or "ultrafine" particulate matter (which are typically 2.5 μm or smaller), but they are still small enough to be easily inhaled and can contribute to indoor air pollution.
