Ok I have a company MacBook Pro that has a USB-C charger and a personal MacBook Air 2013. I have an adapter that I use to connect all things on Pro: 
My Air charger stop to respond. Can I use the USB-C charger with this adapter to charge the Air?
Safe to use USB-C Charger (adapter) for Macbook Air 2013
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Best Answer
That will not work on MBA 2013,
It has only one port where you can charge it (the magsafe plug).
You will need new power charger for your MB Air 2013.
About USB...
till the USB/C came out the USB were only data ports (with 5 Volt) and could not handle the power needed to charge a Mac.
To charge your 2013 MacBook Air you need 16-18 Volts input and correct 5 pins plug.