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Ap-42, compilation of air pollutant emissions factors, has been published since 1972 as the primary compilation of epas emissions factor information.It contains emissions factors and process information for more than 200 air pollution source categories.
We are a large-scale joint-stock enterprise integrating scientific research, production and sales.Our leading products have crushing equipment, sand making equipment, mobile crusher, etc., Each type of product is with complete specifications. All products have passed ISO9001, CE and GOST international quality system certification.