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Air Contaminant Problem Solving & Indoor Air Quality


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1. U.S. Occupational Safety and Health Administration (OSHA) Permissible Exposure
Levels (PEL's) expressed in 8 hour Time Weighted Average TWA values in ppmvolume
or mg/m3.


2. American Conference of Governmental Industrial Hygienists (ACGIH) Threshold
Limit Values (TLV's) values in ppmvolume and mg/m3.


3. Federal agency the National Institute for Occupational Safety and Health (NIOSH)
provides Recommended exposure limits of 8 hour Time Weighted Average (TWA)
ppmvolume and Short Term Exposure Level (STEL) ppmvolume and they provide the
OSHA values in their books.


4. U.S. Environmental Protection Agency (EPA) RfD's (mg/kg body weight/day) for
chemical non-cancer effects.
a. No Observable Effect Level (NOEL) mg/kg body weight/day.
b. Lowest Observed Adverse Effect Level (LOAEL) mg/kg body weight/day.


5. Cancer risk Analysis using the Intake Dose (mg/kg body weight) times the Slope
Factor also Called the Cancer Potency Factor provides the number of cancers per 1,000,000 people.


6. Welding Area Ventilation or Required to Maintain a PEL (mg/m3) based on the
Contaminant Generation Rate (lbs/hr) Which is calculated From the Welding Rod Usage (lbs/hr).


7. Viable and Nonviable Particulate.

8. Combustion Gases, Water Vapor and Particulate.

9. Volatile Organic Compounds (VOC's) and Abatement.

10. Contaminants in Blood, Serum, Urine and Hair and Limit of Detection Values.

11. Bioaerosols, Viruses & Biological Contaminants.

12. Odor Threshold Concentrations ppmvolume and mg/m3 values.

13. Detection Instruments & Mass Flow Analysis.

14. Indoor Air Quality Background

15. Industrial Hygiene and Toxicology Background.




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