Ключевые слова: 2019ncov, air, asian, care, city, corona, coronavirus, covid19, disease, environment, epidemic, face, female, filter, flu, health, illness, infected, infection, mask, medical, outbreak, pandemic, passenger, patient, people, person, pm25, pollution, prevention, protect, protection, protective, public, quality, quarantine, respiratory, sick, sickness, thailand, train, unhygienic, wearing, woman,