Polychlorinated biphenyls
Polychlorinated biphenyls (PCB's) have no known natural sources. They have been used as
electrical insulators and also as coolants and lubricants. They are toxic and can accumulate in the
food chain because they do not break down readily. They can travel long distances by air. Almost
everyone has been environmentally exposed and has low levels in their body. The manufacture of
PCB's was stopped in the U. S. in 1977. Products made before that time that may contain PCB's
are fluorescent lighting fixtures and electrical devices containing PCB capacitors.
Sulfur Dioxide
Sulfur dioxide is a colorless gas released by burning sulfur or heating metal sulfides in air. It is
used in the manufacture of special glass, textile processing and as a preservative in wood and
pulp. It is also used as a solvent in chemical textile, photography, metal and rubber industries. It
is used as a refrigerant in commercial refrigerators. Three parts per million has an easily
noticeable odor. The OSHA PEL is 5 ppm over an eight hour period.
Volatile Organic Compounds
Compounds containing carbon atoms are called organic compounds. Volatile compounds are
easily released into the air. Volatile organic compounds (VOC's) are released into the air from
burning fuel. Car exhausts are an important source of VOC's. They are also released from paint,
solvents, and cleaning products as well as many other common household products and
furnishings. The indoor levels are usually higher than outdoor levels.
4.0
Findings
See attached
NYC-WTC 000105215
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000105215Source: NYC Law Department, mirrored locally
Joint announcement of a comprehensive plan by the EPA and city partners to address indoor air quality concerns in residential units south of Canal Street.
Comprehensive FAQ addressing downtown building access, reopening areas, property manager contact procedures, and building damage status in lower Manhattan.
A project proposal outlining the timeline, methods, and justification for cleaning HVAC systems in residential units affected by World Trade Center dust.