@article {tan2003overview,
	title = {An overview of particulate matter in indoor environments: sources and effects},
	journal = {ASHRAE Transactions},
	volume = {109},
	year = {2003},
	pages = {89},
	publisher = {American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc.},
	author = {Tan, Zhongchao and Zhang, Yuanhui}
}