Nano/micron particles released from newspapers under different reading conditions

Area of Science:

• Environmental Science
• Aerosol Science
• Public Health

Background:

• Printed newspapers remain a key information source despite widespread internet use.
• Indoor air quality is crucial, especially in confined or poorly ventilated spaces.

Purpose of the Study:

• To investigate particle release profiles from newspapers during simulated reading in indoor environments.
• To quantify particle concentrations and characteristics associated with newspaper handling.

Main Methods:

• Simulated reading conditions: no agitation (NoAg), agitation (Ag), and post-reading (PostR).
• Measurement of particle number (ΣN), surface area (ΣA), and volume (ΣV) concentrations.
• Analysis of particle size distribution and critical diameters for electroadhesion and inertial detachment.

Main Results:

• Agitation (Ag) led to a decrease in ultrafine particle number concentration (<200 nm) due to electroadhesion.
• Agitation significantly increased fine (1-2.5 μm) and coarse mode (2.5-10 μm) particle surface area and volume concentrations via inertial detachment.
• Critical particle number diameter (CPND) at 207-310 nm and critical particle volume diameter (CPVD) at 130-497 nm were identified, indicating simultaneous electroadhesion and inertial detachment mechanisms.
• Measured particle mass concentrations ranged from 168.7-534.3 μg/m³ in a small micro-environment.

Conclusions:

• Newspaper reading, especially with agitation in confined spaces, releases substantial particle concentrations.
• Simultaneous electroadhesion of smaller particles and inertial detachment of larger particles influence indoor air quality.
• Inhalation of these particles presents a potential health risk for individuals regularly reading newspapers indoors.