<Tr> <Td> Other Transport </Td> <Td> 7% </Td> </Tr> <Tr> <Td> Commercial and Residential Heating </Td> <Td> 7% </Td> </Tr> <Tr> <Td> Agriculture </Td> <Td> 7% </Td> </Tr> <Tr> <Td> HFCs </Td> <Td> 2% </Td> </Tr>

When the clear air act was revised in 1990 it gave states