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World Health Organization (WHO) Air Quality Guidelines

Compound	Guideline	Exposure
Carbon monoxide	100mg/m3 (90 ppm)	15 min
	60mg/m3 (50 ppm)	30 min
	30mg/m3 (25 ppm)	1 hr
	10mg/m3 (10 ppm)	8 hrs
Lead	0.5 to 1 mg/m3	annual
Nitrogen dioxide	200µg/m3 (.11 ppm) 40-50µg/m3 (.021-.026 ppm)	1 hr annual
Ozone	120µg/m3 (.06 ppm)	8 hrs
PM10	no evident threshold US: 50µg/m3 (25 ppm) EU: 20-40µg/m3 (10 ppm)	annual
Sulfur dioxide	500µg/m3 (.175 ppm) 125µg/m3 (.044 ppm)	24 hrs

Related links

Air Quality Guidelines, WHO, 1999

The views presented in this section do not necessarily reflect the views or position of ADB, or its Board of Directors or the Governments they represent. ADB does not guarantee the accuracy of the data included beyond these links and accepts no responsibility for consequences arising from their use. The term "country" does not imply any judgment by ADB as to the legal or other status of any territorial entity.

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