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. 2014 Nov 8;12(1):57–67. doi: 10.1007/s10393-014-0990-3

Table 1.

WHO Guidelines for CO and PM2.5

Averaging time CO mg/m3 PM2.5 μg/m3 PM10 μg/m3
Annual – 10 20
24 h – 25 50
15 min 100 – –
1 h 35 – –
8 h 10 – –
24 h 7 – –