| ACGIH |
American Conference of Governmental Industrial Hygienists |
| AI |
Asphalt Institute |
| APP |
atactic polypropylene |
| ARMA |
Asphalt Roofing Manufacturers’ Association |
| B[a]P |
benzo[a]pyrene |
| BUR |
built-up roofing |
| °C |
degrees Celsius |
| cfm |
cubic feet per minute |
| CFR |
Code of Federal Regulations |
| cm |
centimeter(s) |
| EPA |
U.S. Environmental Protection Agency |
| °F |
degrees Fahrenheit |
| Fed. Reg. |
Federal Register |
| ft |
foot (feet) |
| GM |
geometric mean |
| GSD |
geometric standard deviation |
| HEPA |
high-efficiency particulate air |
| HHE |
Health Hazard Evaluation |
| HPLC |
high performance liquid chromatography |
| hr |
hour(s) |
| lb |
pound(s) |
| LEV |
local exhaust ventilation |
| m |
meter(s) |
| mg |
milligram(s) |
| min |
minute(s) |
| NAICS |
North American Industry Classification System |
| ng |
nanogram(s) |
| NIOSH |
National Institute for Occupational Safety and Health |
| NRCA |
National Roofing Contractors Association |
| NSPS |
new source performance standards |
| OSHA |
Occupational Safety and Health Administration |
| OV |
organic vapor |
| PAHs |
polycyclic aromatic hydrocarbons |
| PAPR |
powered, air-purifying respirator |
| PBZ |
personal breathing zone |
| PEL |
permissible exposure limit |
| PPE |
personal protective equipment |
| REL |
recommended exposure limit |
| SBS |
styrene-butadiene-styrene |
| SD |
standard deviation |
| TLV |
threshold limit value |
| TWA |
time-weighted average |
| VOCs |
volatile organic compounds |
| % |
percent |
Abbreviations 
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