Chemical plants and other industrial facilities had been required to curb their toxic emissions. A New York Times investigation shows how they got out of it.
The president temporarily waived clean-air rules for industrial facilities that spew cancer-causing gases. Then his appointees worked to gut the regulations altogether.
As Kevin Rees is jailed for 15 years for blowing up a Ulez camera with a homemade bomb, Dr Tilak Doshi looks at why London's anti-motorist money-making 'clean air' scheme is so widely hated.