不过，据凯顿博士所说，“也可能是空气污染恶化了病人对于他们身体健康的感知，从而可能导致更多的心理问题。”
According to Katon, however, "it could be that air pollution worsens patients' perception of their health, which could then cause more psychological problems."
专家称，工作负担、心理压力、环境污染和不健康的生活习惯等因素，是导致这一人群增多的主因。
Factors like heavy workloads, stress, environmental pollution and unhealthy lifestyles are known to be related to a rising infertility level, experts said.
墨西哥城不是实际上与心理障碍有关的唯一污染源。
Mexico City is not the only source of real-world pollution that has been linked to mental impairments.
比如环境污染，交通拥挤，需特殊处理废物的激增，以及由此造成的负面心理及社会影响。
Such as environmental pollution, traffic jams, the proliferation of waste requiring special handling, and the resulting negative psychological and social impact.
比如环境污染，交通拥挤，需特殊处理废物的激增，以及由此造成的负面心理及社会影响。
Such as environmental pollution, traffic jams, the proliferation of waste requiring special handling, and the resulting negative psychological and social impact.
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