the deterioration of air quality 日益恶化的空气质量 threaten public health and safety 威胁公共健康与安全 ..
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I would like to express the fact that more city dwellers are suffering respiratory disease due to the deterioration of air quality.
我想表达的是由于越来越差的空气质量，越来越多的城市居民都患上了呼吸道疾病。
The central competent authority in conjunction with the relevant agencies shall determine the emergency control regulations for the serious deterioration of air quality in the foregoing paragraph.
前项空气品质严重恶化之紧急防制办法，由中央主管机关会同有关机关定之。
As amended in 1977 by addition of sections 160-169, the Clean Air Act requires that SIPs include measures to "prevent the significant deterioration" of air quality.
1977年修正并增加第160至169条款，《洁净空气法案》要求，《州实施计划》应包括“防止空气质量严重恶化”的措施。
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