Without human production activities, that is to say, without more pollution sources, the existing pollution will be gradually digested according to the adjustment ability of nature now, but the time will definitely be longer. There must be a professional organization that can calculate the specific time, but it can certainly be digested naturally.
Therefore, it is impossible for human beings to stop production activities, but we should take more care of the environment on which we live and put an end to environmental pollution. This is everyone's responsibility.