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ČSN EN 16450 In order to be in compliance with EU Air Quality Directive requirements, the reference methods given in the Directive 2008/50/EC [1] for the measurement of mass concentrations of particulate matter are not commonly used for operation in routine monitoring networks. These networks usually apply automated continuous measurement systems (AMS), such as those based on the use of oscillating microbalances, ß-ray attenuation, or in situ optical methods. Such AMS are typically capable of producing 24-h average measurement values over a measurement range up to 1 000 µg/m3 and 1-h average measurement values up to 10 000 ?g/m3, if applicable, where the volume of air is the volume at ambient conditions near the inlet. The 1-h average values may be used for: a) direct information of the public; b) aggregation to produce daily or yearly average concentration values for regulatory reporting purposes.