Nuveen Ohio Municipal Bond Fund 

This fund aims to generate a substantial level of current income for investors that is exempt from federal, Ohio state, and in certain situations, Ohio local income taxes, all while striving to preserve the original capital invested. Typically, the fund allocates a minimum of 80% of its total assets to high-quality municipal bonds. These bonds must be rated investment grade (BBB/Baa or higher) by at least one independent credit rating agency at the time of purchase, or, if unrated, assessed by the fund's sub-adviser to possess equivalent creditworthiness. Furthermore, the portfolio has the discretion to allocate up to 20% of its assets to municipal bonds considered below investment grade, commonly known as "high-yield" or "junk" bonds.