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By Seth Borenstein The Associated Press

America’s air isn’t getting cleaner as fast as it used to

DENVER — For decades America’s air was getting cleaner as levels of a key smog ingredient steadily dropped. That changed about seven years ago when pollution reductions levelled off, a new study found.

This means when tighter federal air quality standards go into effect later this year, many more cities may find themselves on the dirty air list.

Astronomers glimpse cosmic dawn, when the stars switched on

WASHINGTON — After the Big Bang, it was cold and black. And then there was light. Now, for the first time, astronomers have glimpsed that dawn of the universe 13.6 billion years ago when the earliest stars were turning on the light in the cosmic darkness.

And if that’s not enough, they may have detected mysterious dark matter at work, too.

Satellites see big fishing’s footprint on the high seas

WASHINGTON — Scientists tag sharks to see where they roam in the high seas, but until now they couldn’t track the seas’ biggest eater: Humans.

By using ships’ own emergency beacons, researchers got the first comprehensive snapshot of industrial fishing’s impacts around the globe. And it’s huge ‚Äî bigger than scientists thought, according to a new study.

Science Says: That Michigan meteor could have been meatier

WASHINGTON — The fireball that streaked through the Michigan sky put on quite a show but as far as potentially killer space rocks, it was merely a flash in the pan.

There are much bigger asteroids careening through our solar system. Scientists who watch for them hope they spot them in time to get people out of the way if a truly dangerous one is heading straight to Earth.

Low oxygen levels, coral bleaching getting worse in oceans

WASHINGTON — Global warming is making the world’s oceans sicker, depleting them of oxygen and harming delicate coral reefs more often, two studies show.

The lower oxygen levels are making marine life far more vulnerable, the researchers said. Oxygen is crucial for nearly all life in the oceans, except for a few microbes.