Which of the following is NOT a valid method for mold sampling?

Visual inspection only is not considered a valid method for mold sampling because it does not involve the collection of samples for laboratory analysis. While visual inspections are an essential part of assessing mold presence, they rely on observation and subjective judgment rather than on objective data.

In contrast, air sampling, surface sampling, and swab sampling are all recognized methods that provide measurable and quantifiable data about mold spores or mycotoxins present in an environment. Air sampling captures airborne mold spores, which is crucial for evaluating indoor air quality. Surface sampling allows for the collection of mold present on various surfaces, which can help in identifying the extent of contamination. Swab sampling involves collecting samples from surfaces to test for mold and is particularly useful for identifying mold species.

Therefore, while visual inspection has value in identifying potential mold problems, it does not provide the scientific rigor required for proper mold assessment, making it an inadequate method for actual sampling.