1. The group of people who have problems with respiratory diseases, such as those with allergies, asthma, emphysema, heart disease, 2
. The children, pregnant women, and the elderly
3.The workers run the risk of getting smog and dust already, such as factory workers in the stone mill. Construction workers, the such high risk should be used N80 type mask (P1)
.
การแปล กรุณารอสักครู่..