A man walks during a sand storm in El-Dafna, Qatar, April 2, 2015 (Photo: Mohamed Atef)

Cars park in a petrol station during a sand storm in El-Dafna, Qatar, April 2, 2015 (Photo: Mohamed Atef)

Cars covered with dust amid a sandstorm in Saudi Arabia on April 2, 2015 (Photo: Hadeer Salah)

Asian laborers cover their faces from the dust as they wait for their ride just outside the Bahrain International Circuit in Sakhir, Bahrain, Wednesday, April 1, 2015 (Photo: AP)

A man walks during a sand storm in Dubai April 2, 2015 (Photo: Reuters)

A woman walks with her face covered during a sand storm in Dubai April 2, 2015 (Photo: Reuters)

Migrant laborers, some wearing face masks, work on a construction site during a sandstorm in Dubai, United Arab Emirates, Thursday, April 2, 2015 (Photo: AP)

Cars are seen driving amid a sandstorm in Riyadh, Saudi Arabia, April 2, 2015 (Photo: Ahmed Abdel-Aal)

Cars are seen driving amid a sandstorm in Riyadh, Saudi Arabia, April 2, 2015 (Photo: Ahmed Abdel-Aal)