@book{3253,
	author = {World Health Organization. },
	title = {Air quality guidelines global update 2005 : },
	publisher = {WHO Regional Office for Europe,},
	year = {2006.},
	address = {Copenhagen : },
	url = {https://apps.who.int/iris/bitstream/handle/10665/107823/9289021926_eng.pdf?sequence=2&isAllowed=y}
}