White Cloud Ceramic can be used in exterior applications in very dusty climates, but it is important to properly clean and maintain the ceramic surface to prevent the buildup of dust and dirt. Regular cleaning with a mild detergent and water can help to keep the surface clean and free from dust. Additionally, applying a protective coating or sealant can help to enhance its resistance against dust and dirt. However, it is always recommended to consult with the manufacturer or a professional for specific product recommendations and to ensure that the ceramic is suitable for the intended exterior application in a dusty climate.