企业周围应无有害气体、烟尘、灰尘、放射性物质及其他扩散性污染源。

There shall be no harmful gas, soot, dust, radioactive substances or other diffusible sources of pollution around the enterprise.

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该模型能定量地描述气体扩散地面浓度分布场，能快捷和科学地预测浓度和源强、风速、大气稳定度以及时间空间等的关系。

The model could describe the concentration field quantitatively, and predict the relationships between concentration and source strength, wind velocity, atmospheric stability, space-time and so on.

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