The Timber Creek Sandstone from the United States can be used for exterior applications in dusty climates. Sandstone is known for its durability and resistance to weathering, making it suitable for outdoor use. However, the specific conditions of the dusty climate should be taken into account.

In dusty climates, regular maintenance may be required to keep the sandstone clean and free from accumulated dust. This can be done through routine cleaning and sealing of the stone surface. Sealing the sandstone can also help to protect it from potential damage caused by dust particles and other environmental factors.

Additionally, choosing the right finish for the sandstone can aid in its suitability for dusty climates. A honed or smooth finish may be more challenging to maintain in such conditions, as dust and dirt can easily settle on the surface. In contrast, a textured or rough finish can help to hide the effects of dust accumulation and reduce the need for frequent cleaning.

In summary, while Timber Creek Sandstone can be used for exterior applications in dusty climates, regular maintenance, proper sealing, and selecting the appropriate finish can help to ensure its durability and aesthetic appeal in such conditions.