What type of reaction is this?
W2 Ag204 Ag + O2

This is an oxidation-reduction (redox) reaction:

Explanation:

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

thats how its supposed to be