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The biased uncertainty of each measurement method was based on previous studies, specifically 3% uncertainty in particle mobility diameter by DMA classification 68 , 4.7% uncertainty in particle aerodynamic diameter by AAC classification 69 , 2.8% uncertainty in particle mass by CPMA classification 70 and 10% uncertainty in particle concentration using a CPC 71

Expert Tips for the Germinating Seeds in Paper Towel Method Select High-Quality Seeds: Start with fresh, high-quality seeds from reputable sources

Additional Risks to Non-Smokers Secondhand smoke is the combination of smoke from a burning cigarette and the smoke exhaled by the smoker

Tobacco is an organic product, subject to moisture loss, aroma degradation, and chemical changes over time