[1]https://www.who.int/news-room/feature-stories/detail/air-pollution--the-invisible-health-threat
[2]Marjaleena Aatamila, Pia K. Verkasalo, Maarit J. Korhonen, Anna Liisa Suominen, Maija-Riitta Hirvonen, Marja K. Viluksela, Aino Nevalainen,Odour annoyance and physical symptoms among residents living near waste treatment centres,Environmental Research,2011, 111(1):164-170