Why is the climate in Beijing so bad?

One is dense population, which brings the self-regulation and repair ability of the environment that is polluted too quickly and breathless, or pollution is simply higher than regulation.

Another is the destruction of ecology by history, which has caused a bad situation near Beijing and directly affected Beijing's environment.

Another point is that people's awareness of environmental protection has not really reached the ideal height. Think about it, smokers, people who have nothing to do but drive around, people who ignore environmental pollution for personal gain, and so on. )