What are they doing in our city to protect the air?

Air protection should be a priority for many cities. If we talk about a specific example, then it is very difficult to achieve that everyone put a filter on the exhaust pipes, and even more so in factories. But the simplest thing that can be done to protect the air is to plant a large number of trees, primarily along the road, because then they will purify the air from exhaust gases. We also need more parks and green squares in the city. This has been done in recent years.