However, efforts to mitigate other stressors, such as by reducing contaminants and noise pollution, could be tried and thus aim to reduce their environmental stress levels.

但是，依然要致力于缓解其他生存压力，比如减少污染物及降低噪声无言，也能够尽力达到降低鲸鱼生长环境压力水平的目的。

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Pollution levels in August reached some of their lowest levels in years, following a 71.3 billion yuan investment in environmental clean-up.

投入了713亿元的环境整治费后，八月份总算达到了历年污染程度最低的水平。

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Smoke from the farm fires contributed about one quarter of the levels of the most dangerous air pollution in the Indian capital, environmental experts said.

环保专家称，农场燃烧秸秆时生成的烟雾为印度首都最严重的空气污染贡献了四分之一的污染物。

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It also provides environmental data, like noise and pollution levels.

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Their results, published in Environmental Pollution, show that as radiation levels in an area rose to 35 microsieverts per hour, the average number of birds dropped by almost a third compared with the areas where radiation levels were only 0.5 microsieverts per hour.

ECONOMIST: Radiation and evolution

These "environmental sensor stations" would use the phone network to offer real-time and hyper-local records of the city's rain levels, pollution and other environmental conditions.

BBC: New York's phone boxes get new lease of life