It clears out the smog, it cleans the streets!

Also it waters all the plants and the forest in the trees and the land! Also after a long spell of rain, the parks are much more verdant green and beautiful, and also you get more clear views of the sky? I also surmise it might be better for the air quality?

Also, it helps grow food, feed livestock?

No rain, no grass. No grass, no delicious and nutritious and great grass fed beef!