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Home » About Ministry » Environment » Standards and Norms » Nepal Ambient Air Quality Standard

Nepal Ambient Air Quality Standard

National Ambient Air Quality Standards for Nepal

Parameters	Units	Averaging Time	Concentration in Ambient Air, maximum	Test Methods
TSP (Total Suspended Particulates)	�g/m3	Annual	-
TSP (Total Suspended Particulates)	�g/m3	24-hours*	230	High Volume Sampling
PM10	�g/m3	Annual	-
PM10	�g/m3	24-hours*	120	Low Volume Sampling
Sulphur Dioxide	�g/m3	Annual	50	Diffusive sampling based on weekly averages
Sulphur Dioxide	�g/m3	24-hours**	70	To be determined before 2005.
Nitrogen Dioxide	�g/m3	Annual	40	Diffusive sampling based on weekly averages
Nitrogen Dioxide	�g/m3	24-hours**	80	To be determined before 2005.
Carbon Monoxide	�g/m3	8 hours**	10,000	To be determined before 2005.
Carbon Monoxide	�g/m3	15 minute	100,000	Indicative samplers ***
Lead	�g/m3	Annual	0.5	Atomic Absorption Spectrometry, analysis of PM10 samples****
Lead	�g/m3	24-hours	-
Benzene	�g/m3	Annual	20*****	Diffusive sampling based on weekly averages
Benzene	�g/m3	24-hours	-

*Note:   24 hourly values shall be met 95% of the time in a year. 18 days per calendar year the standard may be exceeded but not on two consecutive days.

**Note:   24 hourly standards for NO2 and SO2 and 8 hours standard for CO are not to be controlled before MoPE has recommended appropriate test methodologies. This will be done before 2005.

***Note:   Control by spot sampling at roadside locations: Minimum one sample per week taken over 15 minutes during peak traffic hours, i.e. in the period 8am - 10am or 3pm - 6pm on a workday. This test method will be re-evaluated by 2005.

****Note:   If representativeness can be proven, yearly averages can be calculated from PM10 samples from selected weekdays from each month of the year.

*****Note:   To be re-evaluated by 2005.

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