We use the following URL to provide safety guidance for ACS, RACES and CERT personnel in disaster areas:
http://www.cdc.gov/niosh/emhaz2.htmlSpecifically regarding respirators:
HAZARD 3: Breathing Dust containing asbestos (from pulverized insulation and fireproofing materials) and silica (from pulverized concrete), which are toxic
Risks:
Short term: irritation of eye, nose, throat, and lung.
Long term: Chronic effects may depend on the extent and the duration of exposure.
General Recommendations:
Workers should be protected from breathing dust.
Respiratory protection: An N-95 or greater respiratory protection is acceptable for most activities, including silica and portland cement dust.
If there is reason to believe there is an asbestos exposure, at not more than 10 times the safe level, use a half mask elastomeric respirator with N,R, or P-100 series filters.
If airborne contaminants are causing eye irritation, full face respirators with P-100 OV/AG combination cartridges should be used.
Respirators must fit properly to protect workers.
Surgical masks should not be used because they do not provide adequate protection.
Dust concentrations in the air must be appropriately monitored.
If dust concentrations are elevated, limit entry to only personnel with adequate respiratory protection.
If symptoms of chest pain or chest tightness are present, or if shortness of breath, or rapid breathing persists following a rest break, then medical attention should be sought.