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Flames leap into the air from a natural gas pipeline fire on Friday, March 14, 2014 north of Fremont. The line erupted about 8:30 a.m. Friday near the intersection of county roads 20 and O, about six miles north of Fremont. No damage to any structures has been reported. Firefighters from four departments were waiting nearby for workers to turn off the gas flow. The flames towered dozens of feet into the sky, and the heat kept firefighters from getting close enough to see what caused the blast. (AP Photo/The Tribune, Chris Zavadil)

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Flames leap into the air from a natural gas pipeline fire on Friday, March 14, 2014 north of Fremont. The line erupted about 8:30 a.m. Friday near the intersection of county roads 20 and O, about six miles north of Fremont. No damage to any structures has been reported. Firefighters from four departments were waiting nearby for workers to turn off the gas flow. The flames towered dozens of feet into the sky, and the heat kept firefighters from getting close enough to see what caused the blast. (AP Photo/The Tribune, Tracy Buffington )

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Flames leap into the air from a natural gas pipeline fire on Friday, March 14, 2014 north of Fremont. The line erupted about 8:30 a.m. Friday near the intersection of county roads 20 and O, about six miles north of Fremont. No damage to any structures has been reported. Firefighters from four departments were waiting nearby for workers to turn off the gas flow. The flames towered dozens of feet into the sky, and the heat kept firefighters from getting close enough to see what caused the blast. (AP Photo/The Tribune, Chris Zavadil)

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A Nickerson firefighter watches the flames from a natural gas pipeline fire on Friday, March 14, 2014 north of Fremont. The line erupted about 8:30 a.m. Friday near the intersection of county roads 20 and O, about six miles north of Fremont. No damage to any structures has been reported. Firefighters from four departments were waiting nearby for workers to turn off the gas flow. The flames towered dozens of feet into the sky, and the heat kept firefighters from getting close enough to see what caused the blast. (AP Photo/The Tribune, Chris Zavadil)

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An electronic road sign reads "Pollution" on the Paris ring road, Friday March 14, 2014. Air pollution that has turned Paris skies a murky yellow is giving a break to millions of French travelers — all public transportation in the Paris region and two other cities is free for the next three days. Nearly three-quarters of France is under alert in what the European Environment Agency says is the worst air pollution since 2007. (AP Photo/Jacques Brinon)

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A layer of smog covers the city of Brussels on Friday March 14, 2014. The INRIX traffic scorecard rated Belgium as the most congested country in the world with the Belgian cities of Antwerp and Brussels the most congested. The INRIX Traffic Scorecard provides a comprehensive analysis of the state of traffic congestion across the world. With more than 300,000 cars entering Brussels everyday and an average of 85,4 hours of traffic jams per car per year, road traffic is one of the main sources of air pollution in Brussels. As a result of the Smog alert maximum speed on the motorway has been cut to 90km/h (55mph). (AP Photo/Geert Vanden Wijngaert)

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An electronic road sign on the Paris ring road reads "Pollution" Friday March 14, 2014. Air pollution that has turned Paris skies a murky yellow is giving a break to millions of French travelers — all public transportation in the Paris region and two other cities is free for the next three days. Nearly three-quarters of France is under alert in what the European Environment Agency says is the worst air pollution since 2007. (AP Photo/Jacques Brinon)

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A layer of smog covers the city of Brussels on Friday March 14, 2014. The INRIX traffic scorecard rated Belgium as the most congested country in the world with the Belgian cities of Antwerp and Brussels the most congested. The INRIX Traffic Scorecard provides a comprehensive analysis of the state of traffic congestion across the world. With more than 300,000 cars entering Brussels everyday and an average of 85,4 hours of traffic jams per car per year, road traffic is one of the main sources of air pollution in Brussels. As a result of the Smog alert maximum speed on the motorway has been cut to 90km/h (55mph). (AP Photo/Geert Vanden Wijngaert)

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The Eiffel Tower, is barely seen through the smog from Paris, Friday, March 14, 2014. Air pollution that has turned Paris skies a murky yellow is giving a break to millions of French travelers ó all public transportation in the Paris region and two other cities is free for the next three days. Nearly three-quarters of France is under alert in what the European Environment Agency says is the worst air pollution since 2007. (AP Photo/Jacques Brinon)