Though yes, there can be such a thing as dust pollution, though it's not often called that. An extreme example is of the 1930s dust storms caused by soil erosion of the Dust Bowl.
@mistke
well i think its a easyest way in saying "dust" than light pollution and then explain what is pollution to a person who dont know what is it? (sry for the bad english i think)
When he said dust pollution he later referred to it as trash. So I think he meant smog which is a legitimate response in some heavenly polluted areas.
@MiiaBestWaifu Just because they might not immediately understand, does not give you the excuse to lie for your convenience. Tell them the truth and if they don't understand the concept, explain it.
Edit: Was she not wearing shorts or pants in that last pic? Did the MC remove them?! or is this just a fan service pic for future reference.