ISO 23210:2009 is not applicable to the sampling of flue gases that are saturated with water vapour.
ISO 23210:2009 is not applicable where the majority of the particles are likely to exceed PM10, for example, in the case of raw gases or plant operating failures.
ISO 23210:2009 cannot be used for the determination of the total mass concentration of dust.
ISO 23210:2009 describes the design, use and theory of round-nozzle impactors. It does not exclude other types of impactors, provided these systems meet the performance criteria specified in ISO 23210:2009 in a validation of the impactor performed by an independent testing laboratory.