Russia's Natalia Paderina and Georgia's Nino Salukvadze hugged after winning Olympic silver and bronze medals, respectively, in the women's 10-meter air pistol competition.

CNN: Olympic shooters hug as their countries do battle

Raun and Ensor conclude that federal air quality standards are adequate where ozone levels are concerned (at 75 parts per billion), but that lives would be saved if particulate matter standards were tightened below the current level of 35 micrograms per cubic meter of air.

FORBES: Researchers Prove Air Pollution Causes Heart Attacks

Just as suddenly the air deadened, and at one point during the night the wind meter read zero.

FORBES: Life

The greater Salt Lake region had up to 130 micrograms of soot per cubic meter on Wednesday, or more than three times the federal clean-air limit, according to the U.S. Environmental Protection Agency.

NPR: Sickening Fog Settles Over Salt Lake City Area