FASWX is a mutual fund offered by Fidelity Investments that focuses on sustainable municipal income. This fund seeks to invest in municipal bonds issued by local governments and agencies that have a strong commitment to environmental, social, and governance (ESG) practices. By investing in these bonds, the fund aims to provide investors with a steady stream of tax-free income while also promoting sustainable and responsible investing. FASWX is managed by Fidelity's Sustainable Investments team, which utilizes a rigorous research process to identify and select municipal bonds that align with their ESG criteria. This fund may be a suitable option for investors looking to support sustainable initiatives while also seeking income from their investments.