The differences discussed above reflect the much stricter European
traffic emission regulations, both present and future,
compared to the rest of the world. However, these are based on
existing and planned regulations, and not on existing technology. In
practice, complying with stricter emission limits becomes gradually
more difficult from a technological point of view. Our results show
that H2 vehicles could be, in fact, part of the solution to fulfill the
future European low emission requirements.