Assertion: pm | /r/CapableOf | limit 10 concentrations
Facets:
value: based on an annual average
type: OTHER
value: to 50 μg/m3
type: OTHER
Source sentences:
text: The 1997 standards retained, but slightly revised, standards for PM 10 , which limited PM 10 concentrations to 50 μg/m3 based on an annual average, and 150 μg/m3 based on a 24-hour average.