Sustainable construction of concrete structures in corrosive environments requires responsible use of locally available materials to extend services life, reduce cradle to grave carbon footprint impact, and to make these structures economical. Conservatism in setting limits for allowable chlorides in new concrete is needed to promote extended service life; however, refinement of industry approaches and standards towards protection against excessive conservatism is also important so that maximum flexibility and use of mixture supplements can be used to optimize reduction in carbon footprint and costs in construction. ACI Committee 222, Corrosion of Metals in Concrete, has recently revised the Guide to Protection of Metals in Concrete Against Corrosion. Due to the significant impact to the industry, considerable variation in existing approaches and serious consequences of corrosion, the committee has also recently promoted initiatives associated with refining chloride limit recommendations for new construction and chloride threshold testing. This includes a recent Special Publication on chloride limits, revision of recommendations in the new guide, formation of a special Task Group, and sponsorship/oversight of ACI’s Concrete Research Council (CRC) funded research for a collaborative study for the development of a standard critical chloride threshold test method. This paper will discuss some of the key updates to the Guide Document, as well as recent initiatives associated with chloride limits and thresholds. Information will be provided on the results of the CRC-funded research sponsored by the committee for a new test method for quantifying chloride limits. It will also discuss the reasons why these issues have been identified as important, impacts to the industry, and future needs.