In the model the contribution from area pollution sources was calculated by transforming it to the background concentration, so the model was greatly simplified.

在模型中尝试性地将面源污染产生的浓度贡献转化到背景值中计算，简化了解析模型。

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In allusion to the characteristics and technical requests of wide-area pollution sources auto -monitoring system, distributed network platform must be adopted to fulfill the systems demand.

针对广域污染源自动监控系统的特点和技术要求，必须采用中间分布式网络平台来满足系统的要求。

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Indoor pollution, which includes sources like home heating and cooking, has remained constant over the past several decades despite advances in the area.

在过去几十年中，来源于诸如家庭供暖和烹饪等的室内污染持续存在，尽管在这方面已经有所改进。

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And because of its location in a basin, pollution in the Los Angeles area caused by diesel exhaust, barges, locomotives and other sources tends to stay put, says Janice Nolen, assistant vice president with National Policy and Advocacy for the American Lung Association.

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