《清洁空气法》授权美国环保局监管有害污染物，如微粒物质和臭氧。
The Clean Air Act mandates the EPA to regulate harmful pollutants such as particulate matter and ozone.
据世界卫生组织称，微粒物的主要成分为硫酸盐、硝酸盐、氨、氯化钠、碳、矿物性粉尘和水。
According to the World Health Organization, the main components of particulate matter are sulfate, nitrates, ammonia, sodium chloride, carbon, mineral dust and water.
这些有机物的微粒在绿色冰山中含量不高，但是冰层中还是积聚了从海水中溶解的有机物。
The green iceberg did not contain large amounts of particles from these organisms, but the ice had accumulated dissolved organic matter from the seawater.
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