sick woman with protective mask coughing on street

adult air allergic allergy atmosphere bacteria bad care city co2 cold contagion contagious contamination coronavirus corvid19 cough coughing cov covid19 danger disease environment epidemic female flu girl hazard healhcare health healthcare ill illness infected infection infectious influenza lady mask medical outbreak outdoor outside ozone pandemic people person pm25 pollution problem protection protective public quarantine sick sickness sneeze sneezing spreading street surgical symptoms teen teenage urban viral virus wearing woman young