Cov pa phem hauv tsev yog cov pa phem hauv tsev los ntawm cov pa phem thiab qhov chaw xws li Carbon Monoxide, Particulate Matter, Volatile Organic Compounds, Radon, Pwm thiab Ozone. Thaum huab cua sab nraum zoov tau ntes cov neeg nyiam ntawm ntau lab, huab cua phem tshaj plaws uas ...
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