The wattage requirements for air tools can vary depending on the specific tool and its power output. It's important to check the manufacturer's specifications for each tool to determine the necessary wattage. In general, smaller air tools like impact wrenches and nail guns require less wattage than larger tools like sanders and grinders. A generator's wattage output should be higher than the wattage requirements of the tools being used to ensure they can operate at their full capacity.