Is the sulfur content of coal high after rain?

Will rise. After the rain, the sulfur content in coal will be higher, because the atmospheric humidity is higher in rainy days, and gases such as SO2 and nitrogen oxides in the air combine with water vapor to form acid rain. Acid rain can reduce dissolved oxygen in surface soil and water and ionize some metal elements. These ionized metal elements often combine with sulfur in coal to form sulfate, which leads to the increase of sulfur content in coal.