Schools, workplaces, businesses, and even homes are places where someone could be subjected to particulate matter (PM) ? a mixture of solid particles and liquid droplets found in the air. PM is a ubiquitous pollutant comprising a complex and ever-changing combination of chemicals, dust, and biologic materials such as allergens. Of special concern is fine particulate matter (PM2.5), PM with a diameter of 2.5 microns ( Health Risks of Indoor Exposure...
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