"WASHINGTON -- The Environmental Protection Agency has quietly signaled it may allow states to release more ozone air pollution, commonly known as smog, dirtying the air in those states and neighboring ones, but the agency did not review the health impact of such a move.

The Trump administration's position is outlined in a highly technical guidance memo about plans states must create and submit for EPA approval under the Clean Air Act's good neighbor requirements. It was sent in August to EPA regional offices and posted on the agency's website, but not announced to the public.

"What factory farm owners portray as “normal odors” from animal waste can cause serious harm to farmers and the residents who live near these large industrial operations."

"The fires burn constantly in and around Onitsha, a growing city nestled on the banks of the Niger River in southern Nigeria. Each fire is surrounded by its own hellscape of rotting food, mounded rubbish, castoff computers, and slaughterhouse scraps, and the blazes — often fueled with old tires sliced into ribbons — incinerate the city’s waste and send out noxious plumes of smoke laden with dangerously high levels of particulate pollution."

"Air pollution kills an estimated 600,000 children every year and causing symptoms ranging from loss of intelligence to obesity and ear infections but there is a limited amount parents can do, a World Health Organization report said on Monday."

"The United Nations shipping agency pushed back this week on any phased entry for tougher marine fuel rules and further tightened regulations that will come into force in 2020."

"A group of 20 U.S. states and several major cities on Friday urged the Trump administration to abandon a proposal to freeze fuel efficiency standards after 2020 and strip California of the ability to impose its own vehicle emissions rules."

"The research the Environmental Protection Agency (EPA) cited in proposing to roll back a major truck pollution rule was “not accurate,” the university that conducted the study has concluded."

"Last spring, air pollution researchers from around the world gathered to discuss their latest findings. Among them were scientists who led landmark studies linking smog and soot to deadly health problems. So it was shocking when one speaker essentially told everyone in the room that they were wrong."

"The Trump administration wants pollution limits on ship fuels that a United Nations maritime agency will implement in 2020 to be phased in to protect consumers from any price spikes in heating and trucking fuels, a White House spokesman said on Friday."