The transportation sector accounts for the greatest share of greenhouse gas (GHG) emissions in the state. In 2018, this was equal to approximately 47% of all GHG emissions, or 175.9 million metric tons of CO2. Nevertheless, New York’s transportation emissions per capita are about 27% below the national average, the second lowest of any other US state. Despite ranking quite favourably at the national level, in 2020, New York and California together account for 18% of the 103.8 million registered passenger vehicles in the US.