CNNd will be holding the PADI Enriched Air (Nitrox) course during March 2020.  The course teaches you to use Enriched Air up to 40% without staged decompression.  For more information please see: https://www.padi.com/padi-courses/enriched-air-diver

You can register for the course by sending e-mail, or joining the Facebook event: https://www.facebook.com/events/624279738327639/