This document specifies tests which are intended to determine the influence of one or more flowing polluting gas(es) at volume fractions less than or equal to 10−6 on test samples and/or articles of metals and alloys with or without corrosion protection under determined conditions of temperature and relative humidity. This document is applicable to a) metals and their alloys, b) metallic coatings (anodic and cathodic), c) metals with conversion coatings, d) metals with anodic oxide coatings, and e) metals with organic coatings.