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Sometimes, the air is not clean. It has tiny dust called fine dust. We can’t see it, but it can hurt our body. Fine dust comes from cars, factories, and smoke. We can check the air on a phone app. Green means the air is clean. Red means the air is dirty. On bad days, we should play inside. If we go outside, we must wear a mask. After we come home, we should wash well. Wash your hands, feet, eyes, and nose. Don’t forget to brush your teeth too! To stay healthy, drink water and eat fruits and vegetables. They help clean our body from dust.