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To protect your camera from dust in Tuscany, keep it in a closed bag between shots and avoid changing lenses outdoors, especially near white roads and unpaved tracks. If you have a zoom covering several focal lengths, take it rather than multiple lenses: you'll limit how often you open the camera body. When you do need to change lenses, shelter from the wind, prepare the new lens before removing the old one, then point the mount downward and close it up quickly. A weather-sealed body resists dust better, but it is not waterproof.
Emporte une manual blower bulb and a clean microfiber cloth. First blow the grains off the lens and body; don't rub them dry, or you risk scratching the glass. Avoid canned compressed air, which can spray liquid or push debris inside. A filter protects the front lens element from scratches, but doesn't stop dust from getting into the body. If you see spots on your photos, test at a small aperture against a light background: if they stay in the same place with several lenses, the sensor may be dirty. Start with the built-in cleaning; for a manual sensor cleaning, follow your camera's manual or leave it to a professional rather than improvising.