North America: Ice rinks and the phaseout of HCFC-22
According to the International Ice Hockey Federation (FIH), there are 1,800 indoor ice rinks depending on refrigeration for their ice in the USA, and 3 250 ice rinks in Canada. The most recent ones generally use ammonia as their refrigerant, but many older ice rink systems can still contain thousand of kilograms of R-22.