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QA101: Common Sense Part 1 is an introduction to basic QA/QC concepts (bias and precision, with control charts of flow rate QC checks), terminology, and a review of the elements of a QAPP for a community assessment (surveys and house walk-throughs for possible sources of poor indoor air quality), or other Level 4 type projects (as categorized by the US EPA). This video is part 1 of the first QA101-Common Sense video series, designed by the Tribal Air Monitoring Support Center of the Institute for Tribal Environmental Professionals.