提供总体取样策略，以确定给定焊接环境中可能大量存在的污染物，决定应取样和分析哪些污染物，以及如何采集样本。

Provides an overall sampling strategy to determine the contaminants that might be present in significant quantities in a given welding environment, deciding which of the contaminents should be sampled and analyzed, how to collect samples.