warning alert pm 2.5 in dust meter application by smartphone.pm 2.5 infographic. information about dust pm2.5 source. air pollutio

air alert application background bad bangkok building burn business car city concept construction danger design dirty dust eco ecology element energy environment face factory flat fog house icon illness illustration industrial inflection infographic information landscape mask meter n95 outdoor pm25 pollutio pollution protect sign smartphonepm smog smoke source symbol terrified thailand town transport tree unhygienic vector warning