The answer to 'why is my tile dusty' is that tile floors can become dusty for a few common reasons. Tile is a hard, non-porous surface that doesn't attract and hold dust like carpets or wood floors. However, the grout between tiles is porous and can trap dust and dirt over time. Improper cleaning techniques or infrequent cleaning can also lead to a buildup of dust on tile floors.
Another common cause of dusty tile is the natural wear and tear of the sealant or finish on the tile. As this protective layer wears down, the tile becomes more prone to collecting dust and dirt. Factors like high foot traffic, pets, and harsh cleaning products can accelerate the breakdown of the tile finish.