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Measuring PM2.5 concentrations from secondhand tobacco vs. marijuana smoke in 9 rooms of a detached 2 story house ScienceDirect What is PM 2.5 and why is it so harmful? Measured PM2.5 indoors and outdoors related to smoking prevalence by Zip code using 14,400 low cost monitors in California, Washington, and Oregon ScienceDirect Particulate matter emissions of four types of one cigarette brand with and without additives: a laser spectrometric particulate matter analysis of secondhand smoke BMJ Open Low cost PM2.5 Sensors: An Assessment of their Suitability for Various Applications Aerosol and Air Quality Research Wildfire smoke contains tiny PM2.5 particles that can pose serious health risks. Here's how you can compare prolonged smoke exposure to smoking cigarettes and what it means. FULL STORY

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