One of the most famous combustible dust explosions, the West Pharmaceuticals Services explosion in 2003, was such a powerful explosion that it broke windows in houses over 1000 feet away, and threw debris over 2 miles, which caused fires and damaged areas where it landed. It killed 6 people and injured over 30.
Luckily, at the time of the explosion the area surrounding the plant was not heavily populated, but just imagine the damage and injuries that would have been caused if more people lived closer to the plant.
Another famous explosion, the West Texas Fertilizer explosion, occurred in 2013 when ammonia nitrate being stored for use in fertilizers exploded, killing 15 people and injuring over 160. Within less than 2000 feet of the plant were a nursing home, a middle school, a hospital, and numerous houses. A high school was just outside the 2000 foot range as well, and the highway was just 3000 feet away.
The middle school building was severely damaged, the nursing home was damaged and many residents were injured when trying to evacuate, and an apartment building close by was completely destroyed by the blast. This explosion occurred at 7:50 pm, when the school was luckily empty of students, but what would have happened to them if the blast had occurred earlier in the day?