What are your own small ways to reduce air pollution?

First of all, I try not to use disposable items in everyday life, so I am looking for alternatives to cups, plastic bags, and so on. When we want plastic bags at the store, we need to pay for the bags, which are small, and also refundable in case you return them the next visit. You can buy plastic bags for waste, which can be used to throw away waste. So when I go shopping, I bring my own shopping bags to save money and not to use unnecessary plastic bags. Secondly, I try not to have leftover food, so I take food as much as I can eat at one time. Before I eat food, I take out food in case it is too much to eat. If food is left too much, it can also be wasted. In addition, I think many people in the world are dying from hunger, so I feel guilty about leftover food. Thirdly, I try to save water, so I use a cup to brush my teeth, block the basin to collect water to the sink, etc. This results in saving our environment.