Name a standard method or guideline used for asbestos air sampling.

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Multiple Choice

Name a standard method or guideline used for asbestos air sampling.

Explanation:
Asbestos air sampling is most commonly done by collecting air through a filter and counting fibers with a microscope using phase-contrast microscopy, following NIOSH Method 7400. This approach provides a practical, widely accepted way to determine asbestos fiber concentration in air (f/cc) and is commonly used for routine monitoring and regulatory compliance. While transmission electron microscopy can offer more detailed analysis, it is more costly and resource-intensive, so PCM-based counting remains the standard for everyday air sampling. The other options relate to sampling for different substances or to guidelines rather than a method for asbestos air sampling.

Asbestos air sampling is most commonly done by collecting air through a filter and counting fibers with a microscope using phase-contrast microscopy, following NIOSH Method 7400. This approach provides a practical, widely accepted way to determine asbestos fiber concentration in air (f/cc) and is commonly used for routine monitoring and regulatory compliance. While transmission electron microscopy can offer more detailed analysis, it is more costly and resource-intensive, so PCM-based counting remains the standard for everyday air sampling. The other options relate to sampling for different substances or to guidelines rather than a method for asbestos air sampling.

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