To get some plants to cover dry ground and reduce dust one could use a dew drip system and grow rows of plants, say with 20 m between rows. Some plants could absorb toxic matter. 
When cold or warmth needs to be transported a long way secondary refrigerants are used. Water is often used as a secondary refrigerant as it holds a lot of heat per kg. So why not cool water using the usual sort of refrigerant and run the cold water through long pipes with spikes on pointing downwards? Dew will form and run down the spikes giving drip irrigation. One could also use bends in the pipe to allow dew to drip down. To prevent frost run hot water through the pipes. The system could be powered by a wind turbine.
To get an idea of how much water one could get from the air you can use my Delphi computer code at 
https://www.facebook.com/groups/WaterFromAir/  or from
 https://airartist.blogspot.com/2019/02/i-have-finished-delphi-computer-program.html