Page 45 - OHS, October 2024

Controls
Th e two countries also align over the use of local exhaust venti-
lation (LEV) as a common control method. LEV is designed to
minimize employee exposure to airborne contaminants in the
workplace by capturing the emission at source and transporting it
to a safe emission point or to a fi lter/scrubber. Monitoring systems
in appropriate locations, close to these sources or attached to a per-
son close to them, off er employers an understanding of the level of
LEV that must be used.
In the US, ventilation regulations are contained as a subpart8 of
the above-mentioned Federal Regulations which reference ANSI
design standards9. In the UK, best practice is contained within
HSG25810 and CoSHH Regulation 9 requires testing by a compe-
tent person as a legal requirement specifi cally to examine, main-
tain and test LEV systems at least every 14 months.
In summary, both real-time direct reading instruments and
personal air sampling pumps have their place in workplace moni-
toring programs in both the U.K. and U.S. Real-time instruments
off er immediate feedback and continuous monitoring capabilities
but may lack specifi city. Personal air sampling pumps provide ac-
curate quantitative data suitable for regulatory compliance but
involve delayed results and require more eff ort in sample collec-
tion and analysis. In the US, the choice between the two methods
depends on the specifi c monitoring needs, budget considerations,
available resources and local and federal legislations.
Tim Turney is Global Marketing Manager at global monitoring
equipment manufacturer Casella, which focuses on reducing occupa-
tional health and environmental risks and supporting businesses in
solving their monitoring and analysis needs.
REFERENCES
1. Control of Substances Hazardous to Health (COSHH), 2002
2. 29 CFR 1910.1000 Occupational Safety and Health Standards, Subpart
Z—TOXIC AND HAZARDOUS SUBSTANCES
3. NIOSH Manual of Analytical Methods (NMAM) 5th Edition
tinyurlcom/3ve5sz7k
4. HSG173 Monitoring strategies for toxic substance tinyurl.com/3r9vavmb
5. Methods for the Determination of Hazardous Substances (MDHS) guidance
tinyurl.com/2v3awwvu
6. EH40/2005 Workplace exposure limits tinyurl.com/jn5cz87x
7. ISO13137:2022 Workplace atmospheres. Pumps for personal sampling of
chemical and biological agents. Requirements and test methods
8. 29 CFR 1910.94 Subpart G Occupational Health and Environmental Control
9. ANSI/ASSP Z9.2-2018: Fundamentals Governing the Design and Operation
of Local Exhaust Ventilation (LEV) Systems
10. HSG258 Controlling airborne contaminants at work: A guide to local
exhaust ventilation (LEV)
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www.ohsonline.com OCTOBER 2024 | Occupational Health & Safety 45