The Us Space Agency will launch a satellite on Sunday at 1002 GMT. According to NASA this is the most sophisticated monitoring satellite ever built.
It will check whether International treaties to repair the ozone layer are working.
The spacecraft promises significant returns for climate studies
The first two, Terra and Aqua, are studying the ground and the oceans. Aura will concentrate on the atmosphere, looking at gases, pollutants, and
chemical reactions.
"Aura's going to be very helpful in tracking whether the ozone layer is recovering, in establishing the relationship between particulates and
atmospheric gases and climate change; and Aura will hopefully also be a very useful tool in developing better predictions of air quality," Rick
Pickering, Aura Project Manager at the Goddard Space Flight Center, told BBC News Online.
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Last year scientists produced evidence that the ozone layer is healing, althou it is still growing, but not at the rate it once was. The satellite
will also establish a relationship between atmospheric gases, particulates and climate change.
It was the third time in less than a week NASA had to delay the launch.
The launch was originally scheduled for Saturday, but was delayed a day and then two days more because of technical problems.
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This satellite is a part of NASA' first series of satellites that observe the Earth system.
An update will continue when more information is available.