What harm will smog pollution do to people and creatures?

Hello, my graduation thesis is about smog. This is the preface of my thesis. I hope it helps you.

Research results at home and abroad show that smog will reduce atmospheric visibility, lead to a series of traffic accidents, close expressway and airports, and bring inconvenience to people. In addition, smog will also endanger human health. PM2.5, the main pollutant of smog, will enter the human body through breathing, even into alveoli, or into the blood to reach all parts of the body. Particulate matter may carry a large number of viruses and toxic and harmful substances, which are harmful to human respiratory tract, nervous system and cardiovascular system. Haze will also affect the growth of crops. When smog occurs, atmospheric radiation and sunshine hours will be reduced, which will weaken the photosynthesis of plant leaves and affect the quality and yield of crops.