求翻译：前些年来，由于人口急剧增长，工业迅猛发展，有害气体、污水和废弃物不达标排放和堆放，造成环境污染问题日益严重。是什么意思？

In previous years, due to rapid population growth, rapid development of industrial, hazardous gas, sewage and waste discharge standards and do not pile up, causing environmental pollution is getting worse.

In previous years, owing to rapid population growth, rapid development, harmful gas industry, sewage and waste is not up to standard and stacked, causing environmental pollution problems have become increasingly serious.

First years, because the population grows suddenly, the industry swift and violent development, the noxious gas, the sewage and the reject do not attain a designated standard discharge and pile up, create the environmental pollution problem to be day by day serious.

In previous years, due to rapid population growth, rapid industrial development, not up to standard and harmful gas, sewage and waste piling up, resulting in a growing problem of environmental pollution.

In previous years, due to rapid population growth, rapid development of industrial, hazardous gas, sewage and waste discharge standards and do not pile up, causing environmental pollution is getting worse.