OSHA (the federal agency within the U.S.
Department of Labor) is the largest, but by no means the only,
government agency dedicated to occupational safety and health. Under
the federal OSH Act, individual states are permitted to \"opt out\" of
federal OSHA. New York, New Jersey and Connecticut have chosen not
to opt out, and so are governed by federal OSHA as to those
private-sector employees that fall within the statute. Each of these
three states, however, has its own agency, within its (state) Department
of Labor that covers public-sector employees. Approximately half the
states do have their own \"little OSHAs,\" as authorized by the federal
statute. The standards promulgated and enforced by \"little OHSAs\"
generally differ but slightly from the federal standards, as the
nationwide statute requires states\' \"little OSHAs\" to afford no less
protection to employees. Excluded from OSHA coverage are mining operations, for which there
is a separate Mine Safety & Health Administration (MSHA). From 1891
until 1977, mine safety was under the U.S. Department of the Interior.
Under the current statute, which moved enforcement from Interior to
Labor, enforcement is under the MSHA, and adjudication under a separate
MSH Review Commission. This organizational setup is borrowed from the
OSH Act. Recently, OSHA and MSHA issued a joint \"Hazard Alert\" concerning
Diesel Exhaust and Diesel Particulate Matter. This is a major hazard in
underground mines, in which diesel-powered equipment is ubiquitous, and
ventilation must be mechanically supplied. However, most heavy
equipment, medium and heavy-duty trucks, bucket lifts and generators
found on construction sites have diesel engines, and so construction
workers are at considerable risk from this hazard, too. Diesel exhaust (DE) is a complex and unwholesome mixture of
chemicals and particulates. It includes both a gas/vapor phase and a
particulate phase, each of which includes both organic and inorganic
components. The major constituents of the gas/vapor phase of DE include carbon
monoxide, oxides of nitrogen, sulfur dioxide, formaldehyde and other
aldehydes, benzene, 1,3-butadiene, and a number of polycyclic aromatic
hydrocarbons. The particulate phase includes clusters of respirable particles,
composed mainly of carbon. A variety of chemicals are contained within,
or adsorbed onto, the DPM, affecting the toxicity of the particulate.
The particles are classified according to size as well as composition. Of particular health concern are fine or ultrafine particles, as
these can get inhaled deep into the lungs. The composition of these
particles is, typically, elemental carbon, with adsorbed compounds such
as various organic compounds, sulfates, nitrate, metals (including
metallic abrasion particles) silicates, ash, and a variety of trace
elements. Short-term exposure to high concentrations of diesel exhaust can
cause irritation to the eyes, nose, throat and lungs, as well as
lightheadedness, coughing and nausea. DE can exacerbate asthma and
cause allergies. Long-term exposure has shown in laboratory studies a
range of dose-dependent inflammation and cell changes in lung tissue.
In June 2012, the International Agency for Cancer Research classified
diesel exhaust as a Group 1 human carcinogen. Miners in underground metal/nonmetal mines have, under the MSH Act,
a permissible exposure limit (PEL) of 160 µg/m3 when measured as an
8-hour time-weighted average. If engineering and administrative
controls do not reduce exposures below the PEL, respiratory protection, a
high-efficiency air-purifying respirator must be worn. OSHA does not presently have a PEL for DPM. However, there do
exist PELs for other components of diesel exhaust (e.g., carbon
monoxide, nitric oxide, and nitrogen dioxide) and monitoring for these
can give some indication of the presence of diesel exhaust, as well as
the effectiveness of engineering and administrative controls aimed at
minimizing employee exposure to such exhaust, when working with or
around diesel-powered equipment. Because, usually, the health impacts of exposure to toxins such as
DPM and other toxins are not so sudden or dramatic as when a trench
caves in, or a worker falls to his death from an elevated surface, there
is some danger of these hazards being overlooked in developing and
implementing a health and safety program. Don\'t think that, because OSHA\'s standards don\'t have a prescribed
PEL for diesel exhaust that you can\'t be cited for employee exposure.
Since it\'s a recognized hazard, it likely falls under the General Duty
Clause. Another consideration to keep in mind is that, under OSHA\'s
\"multi-employer policy,\" you can be cited if your employees are exposed
to unhealthful levels of DE, even if the source is diesel equipment operated by another employer or employers. While monitoring for air quality and employing an industrial hygienist are seldom if ever bad ideas, these are definitely
steps you should take, if you utilize diesel-powered equipment indoors,
or in semi-enclosed spaces (such as parking garages). Likewise, if
your employees must work where other employers\' activities are creating a
potential DE hazard, having an industrial hygienist monitor the air
provides you with a stronger basis to negotiate abatement, if needed,
with the trade creating the hazard, the GC, and/or the owner. Assuming only open-air use of diesel-powered equipment, except in
unusual circumstances the primary strategy in keeping employee exposure
to DE at tolerable levels will be a combination of engineering controls.
Examples of these include: Administrative controls (changing procedures to reduce or eliminate
the hazard) should also be employed. A few you should consider are
these:
If you would like more information regarding this topic please contact Thomas H. Welby at twelby@wbgllp.com or call (914) 428-2100