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4. NASG

DIN Standards Committee Safety Design Principles

Overview

Sampling conventions to define idealized samplers for estimating the deposition of non-volatile, non-hygroscopic, non-fibrous aerosols in five specific loci of the respiratory tract are specified. The five loci consist of the anterior and posterior areas of the nasal passages, the ciliated and non-ciliated parts of the tracheobronchial area, and the alveolar (gas exchange) region. The conventions are separated into three independent sampling efficiencies defined in terms of thermodynamic diameter characterizing the diffusive (Brownian) motion of sub-micrometre particles and four efficiencies in terms of aerodynamic diameter of more than 0,1 µm characterizing deposition by impaction, interception or gravitational settling. Each conventional curve has been developed as an average of 12 deposition curves corresponding to 12 breathing conditions ranging from sitting to heavy exercise, male versus female, and breathing mode (mouth versus nasal breathing). The standard has been prepared in accordance with the Vienna Agreement under the leadership of ISO/TC 146/SC 2 "Workplace atmospheres" (secretariat: ANSI, USA) in collaboration with CEN/TC 137 "Assessment of workplace exposure to chemical and biological agents" (secretariat: DIN). The responsible German standardization committee is Working Group NA 095-03-01-01 AK "Staub" ("Particulate matter") of Working Committee "Messstrategien und Anforderungen an Messverfahren"("Measurement strategies and requirements for test methods") of NASG.

Document: references other documents

Responsible national committee

NA 095-03-01-01 AK - Particulate matter  

Responsible european committee

CEN/TC 137 - Assessment of workplace exposure to chemical and biological agents