以下为句子列表：
英文: Port authorities and shipping operators in the United States and Europe are under increasing political pressure to improve air quality in ports, which are often located in sensitive marine environments or large densely populated cities.
中文: 美国和欧洲的港务局和船运运营商正面临着越来越大的改善港口空气质量的政治压力，这些港口通常位于易受影响的海运环境或者人口密度大的大城市。
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