ISO 7708:1995 PDF

Overview

ISO 7708:1995 - "Air quality - Particle size fraction definitions for health-related sampling" defines internationally accepted sampling conventions for airborne particle size fractions used when assessing health effects in occupational and ambient environments. The standard specifies target collection curves for the inhalable, thoracic and respirable fractions (with extrathoracic and tracheobronchial fractions derived from those conventions). Conventions are expressed in terms of particle aerodynamic diameter and mass fractions and are intended to improve the relationship between measured concentration and potential health risk.

Key topics and technical requirements

• Sampling conventions and definitions: Clear definitions for inhalable, thoracic, tracheobronchial, extrathoracic and respirable fractions and corresponding target specifications for sampling instruments.
• Inhalable convention: Target collection curve averaged over wind directions for typical breathing rates (equation form provided for windspeeds u