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Evidence Based Medicine (EBM) has become a common paradigm in medicine.The notion that action should be based on scientific evidence also applies to public health. The assessment of evi-dence and the application of evidence based ac-tion is a challenge both in EBM and public health. The focus of this article is Evidence Based Public Health (EBPH).We use the issue of air pollution related health as an educational example for EBPH. Key words: evidence based public health; air pollu-tion; environmental health Summary Evidence Based Medicine (EBM) has become a common paradigm in medicine [1]. It is the con