The Spains Arena Limestone can be used in exterior applications in dusty climates with some considerations. Limestone is a durable natural stone that is commonly used in construction projects, including exterior applications such as building facades, walkways, or walls.

However, in very dusty climates, there are a few factors to consider:

1. Dust accumulation: Dust can settle on surfaces over time, including on limestone. In dusty climates, regular cleaning and maintenance may be required to keep the limestone looking its best. Power washing or using a soft brush to remove dust buildup can help maintain its appearance.

2. Weathering: Excessive exposure to dust, combined with other environmental factors such as rain, wind, or extreme temperatures, can accelerate the weathering process of limestone. This may cause the stone to deteriorate or discolor over time. Applying a suitable sealant or protective coating can help minimize the impact of dust and other weathering factors.

3. Surface texture: The Spains Arena Limestone, like any other limestone, may have a textured or porous surface. In dusty climates, the texture of the stone may attract and trap dust particles more easily. This can make cleaning and maintenance more challenging compared to smoother surfaces.

To ensure the best performance and longevity of the limestone in a very dusty climate, it is advisable to consult with experienced professionals, such as architects, contractors, or stone specialists. They can provide specific recommendations and advice based on your location, climate conditions, and the intended use of the limestone in exterior applications.