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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)

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Jenenne Whitfield, Heidelberg Project director, addresses attendees during a vigil at the site of the latest fire at the Heidelberg Project in Detroit, Thursday, March 13, 2014. A March 7 fire destroyed a house covered in stuffed animals and dolls that was part of the Heidelberg Project. It was the latest casualty in a 10-month string of suspicious fires at houses that are part of the interactive outdoor art installation. Tyree Guyton founded the Heidelberg Project on Detroit's east side in 1986 as a response to urban decay. (AP Photo/The Saginaw News, Katie Bailey) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

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Katie Hearn, Heidelberg Project marketing coordinator, left, lights a candle for Kobe Jones, 12, during a vigil at the site of the latest fire at the Heidelberg Project in Detroit, Thursday, March 13, 2014. A March 7 fire destroyed a house covered in stuffed animals and dolls that was part of the Heidelberg Project. It was the latest casualty in a 10-month string of suspicious fires at houses that are part of the interactive outdoor art installation. Tyree Guyton founded the Heidelberg Project on Detroit's east side in 1986 as a response to urban decay. (AP Photo/The Saginaw News, Katie Bailey) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

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James Laginess, left, lights candles during a vigil at the site of the latest fire at the Heidelberg Project in Detroit, Thursday, March 13, 2014. A March 7 fire destroyed a house covered in stuffed animals and dolls that was part of the Heidelberg Project. It was the latest casualty in a 10-month string of suspicious fires at houses that are part of the interactive outdoor art installation. Tyree Guyton founded the Heidelberg Project on Detroit's east side in 1986 as a response to urban decay. (AP Photo/The Saginaw News, Katie Bailey) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

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Attendees raise their hands and candles during a vigil at the site of the latest fire at the Heidelberg Project in Detroit, Thursday, March 13, 2014. A March 7 fire destroyed a house covered in stuffed animals and dolls that was part of the Heidelberg Project. It was the latest casualty in a 10-month string of suspicious fires at houses that are part of the interactive outdoor art installation. Tyree Guyton founded the Heidelberg Project on Detroit's east side in 1986 as a response to urban decay. (AP Photo/The Saginaw News, Katie Bailey) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

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Sam Deniston, right, of Detroit, talks with Heidelberg Project artist and founder Tyree Guyton at a vigil at the site of the latest fire at the Heidelberg Project in Detroit, Thursday, March 13, 2014. A March 7 fire destroyed a house covered in stuffed animals and dolls that was part of the Heidelberg Project. It was the latest casualty in a 10-month string of suspicious fires at houses that are part of the interactive outdoor art installation. Guyton founded the Heidelberg Project on Detroit's east side in 1986 as a response to urban decay. (AP Photo/The Saginaw News, Katie Bailey) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

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Jenenne Whitfield, Heidelberg Project director, addresses attendees at a vigil at the site of the latest fire at the Heidelberg Project in Detroit, Thursday, March 13, 2014. A March 7 fire destroyed a house covered in stuffed animals and dolls that was part of the Heidelberg Project. It was the latest casualty in a 10-month string of suspicious fires at houses that are part of the interactive outdoor art installation. Tyree Guyton founded the Heidelberg Project on Detroit's east side in 1986 as a response to urban decay. (AP Photo/The Saginaw News, Katie Bailey) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT

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Attendees raise their candles during a vigil at the site of the latest fire at the Heidelberg Project in Detroit, Thursday, March 13, 2014. A March 7 fire destroyed a house covered in stuffed animals and dolls that was part of the Heidelberg Project. It was the latest casualty in a 10-month string of suspicious fires at houses that are part of the interactive outdoor art installation. Tyree Guyton founded the Heidelberg Project on Detroit's east side in 1986 as a response to urban decay. (AP Photo/The Saginaw News, Katie Bailey) ALL LOCAL TV OUT; LOCAL TV INTERNET OUT