Dust particles can be 100 times smaller than a grain of sand. You don’t need to see them to breathe them in. Once in your lungs, dust will start causing damage.
Exposure to dust can lead to severe breathing difficulties and lung diseases that can ruin lives and cause an early death.
It can take years before the damage is visible and by then it can be too late. Make sure you are aware of the risks and work in ways that always protect your lung health.