please google

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Note added at 15 мин (2013-09-16 19:40:20 GMT)
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for instance, -
the unit complies with environmental laws in all operation modes

-

or environmental impact indicators are (maintained) sustainable

Environmental control:
the maintenance of safe levels of light exposure, humidity, temperature, air pollution, air movement, dirt... Holding constant the physical environment of the experiment.

Environmental impact:
set of the effects that a structure (industrial system, electrical system, road, etc.) provokes on the surrounding environment, inducing alterations or disturbances to single components of the entire environmental system. ... Any change to the environment, whether adverse or beneficial, wholly or partially resulting from an organization's activities, products or services.
http://www.edison.it/en/energy-from-a-to-z/environment-and-p... E

Sustainability:
is the capacity to endure. In ecology the word describes how biological systems remain diverse and productive over time. ... Long-lived and healthy wetlands and forests are examples of sustainable biological systems. For humans, sustainability is the potential for long-term maintenance of well being, which has ecological, economic, political and cultural dimensions
http://en.wikipedia.org/wiki/Sustainability


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Note added at 7 hrs (2013-09-17 02:33:12 GMT)
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"environmental impact indicator" image example:
http://www.agropolis.org/agronomy/research.php?id=16

Pollution control is a term used in environmental management. It means the control of emissions and effluents into air, water or soil. Without pollution control, the waste products from consumption, heating, agriculture, mining, manufacturing, transportation and other human activities, whether they accumulate or disperse, will degrade the environment. In the hierarchy of controls, pollution prevention and waste minimization are more desirable than pollution control. In the field of land development, low impact development is a similar technique for the prevention of urban runoff.

....

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Note added at 20 hrs (2013-09-17 15:57:28 GMT)
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Here different parameters are listed, so 'following' may be added in the beginning.