Table 3.

Current status of indoor PM_2.5 pollution.

Building Type	Sampling Location	Sampling Condition	Average Indoor PM2.5 Concentration (μg·m−3)	References	Times Exceeding Limit Set by Standard
Public place	Chongqing	Business hour	211 (68–468)	[176]	6.03
Public place	Ma’anshan	Business hour	133.73 (74.96–259.28)	[177]	3.82
Residential building	Lanzhou	Daily routine	Kitchen: 124.75 (48.14–279.25); Bedroom: 118.91 (38.34–367.62)	[178]	3.56; 3.40
Residential building	Nanjing	No cooking, no smoking	80 (47–113)	[179]	2.29
Hospital	Shenzhen	Business hour	36.71 (4.98–318.01)	[180]	1.05
Government agency	Tianjin	Business hour	71.0 (1–380)	[181]	2.03
Shopping mall	Beijing	Business hour	47 (9–253)	[182]	1.34
Market	Beijing	Business hour	56.21–61.36	[183]	1.61–2.25
Food court	Nanchang	Business hour	164 (38.03–492.73)	[184]	4.69