Smaller Dirty Industry for Anno 117: Pax Romana is a free mod designed for Windows that enhances gameplay by adjusting the area of effect for various dirty production buildings and mountain/mine slots. This mod reduces the radius of these buildings by approximately 25%, allowing players to create more densely populated cities and diverse agricultural areas while still retaining gameplay challenges. The modifications specifically target buildings such as the Charcoal Forest, Tile Maker, and Pig Farm, among others, facilitating a more strategic approach to city planning.

The mod updates the value for the affected buildings to '15', which encourages players to rethink their layouts and resource management. As of version 1.7, several additional buildings including the Glass Smelter and Goldsmith have been incorporated into the mod. Currently, compatibility issues remain unknown, but the mod's focus on optimizing space usage makes it a valuable addition for players looking to enhance their Anno 117 experience.