The owners of businesses that spew diesel fumes and other toxic gases will have to drastically cut emissions if they want to build, modify or expand their facilities, according to stringent new regulations announced Wednesday by the Bay Area Air Quality Management District. The new permitting requirements, which were approved Jan. 6, will force some businesses to emit two to three times less pollution than what is currently allowed or move, said Ana Sandoval, the spokeswoman for the air quality district. The district conducts several hundred health risk screenings a year, the vast majority of which are for new or...