How much dust does a person inhale in a typical lifetime?

On average, a person inhales about 0.5 to 1 gram of dust per day, depending on environmental factors and individual habits. Over a typical lifetime of around 80 years, this could amount to approximately 15 to 30 kilograms of dust inhaled. The composition of this dust can vary widely, including particles from soil, pollen, and human-made substances.