The pollution problem caused by garbage exudates is most serious in countries with an annual per capita output of between $4000 and $5000, while it is less serious in relatively poor or rich countries  In the initial stage of industrial development, the pollution problem is relatively serious  When industrial development can create enough means to deal with such problems, the pollution problem will be reduced
In the next few years, the industrial development of country X will grow.
 At present, the per capita output value of country X is US $5000 per year, and the pollution caused by garbage exudates in country X will gradually decrease in the next few years