little asian girl wearing mask for protect pm2.5 and show thumbs up gesture for good air outdoor.air pollution pm2.5

19 25 air asian cheer cheerful child childhood concept corona coronavirus covid covid19 disease distancing education epidemic face family flu gesture girl good hand happy health home homeschool ill kid learning little lockdown mask medical new normal outdoorair people pm pm25 pollution positive protect quarantine safe school show social student study thumbs virus wearing