Good news.
The ATC strike is called off.
Article in French click here
Also, no strike impact on Paris underground or Bus system.
However, only 1/3 of RER B trains to CDG airport. Trains go Only between CDG and Gare du Nord, to go to destinations further South, including the central Paris stops of the RER B line you have to change at Gare du Nord.
Also, national railway system is impacted by strikes, about 60% of long distance high speed trains running.