The Corgoloin Limestone from France can generally be used in exterior applications, but its suitability for very dusty climates may vary. Limestone is a natural stone that is durable, weather-resistant, and commonly used in construction. However, it is important to consider a few factors when using limestone in dusty climates:

1. Porosity: Limestone is a porous stone, which means it can absorb moisture and dust particles. In very dusty environments, the limestone may absorb dust and dirt, causing discoloration or staining over time. Regular cleaning and maintenance would be necessary to keep the stone looking its best.

2. Finishes: Different finishes can greatly influence the performance of limestone in exterior applications. A honed or polished finish may be more susceptible to dust particles sticking to its smooth surface, while a more textured or tumbled finish could be less affected.

3. Climate and Environmental Factors: Dusty climates often come with other environmental factors such as high winds or extreme temperature variations. These conditions can accelerate the weathering process of limestone and affect its overall performance over time.

It is highly recommended to consult with a local stone supplier or a professional architect or designer who specializes in building materials for dusty climates. They can provide specific advice and guidance on the suitability of the Corgoloin Limestone for your particular climate and suggest proper maintenance techniques to minimize the impact of dust and dirt accumulation.