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B&B supports teachers going back to school safely. If you are a teacher, please message us to get a free mask! B&B supports teachers going back to school safely. If you are a teacher, please message us to get a free mask!

What is PM2.5?

PM means particulate matter, PM2.5 refers to particulate matter not larger than 2.5 microns in the atmosphere, also known as pulmonary particulate matter. Most of daily smog weather is caused by PM2.5. Due to its small mass and longtime of carrying toxic substances, it is harmful to people.