A traffic light shows red as a dust storm blankets the Sydney Harbour Bridge at sunrise September 23, 2009. Gale force winds battered eastern Australia bringing huge dust storms to the nation's heavily populated east coast. REUTERS/Tim Wimborne (AUSTRALIA ENVIRONMENT SOCIETY) 

A man walks during a sand storm in Dubai April 2, 2015. REUTERS/Ahmed Jadallah TPX IMAGES OF THE DAY

Strong winds blow dust over buildings located on the outskirts of Beijing February 6, 2012. REUTERS/David Gray (CHINA - Tags: ENVIRONMENT CITYSPACE) 

Private First Class Brandon Voris, 19, of Lebanon, Ohio, from the First Battalion Eighth Marines Alpha Company stands in the middle of his camp as a sandstorm hits his remote outpost near Kunjak in southern Afghanistan's Helmand province, October 28, 2010. REUTERS/Finbarr O'Reilly (AFGHANISTAN - Tags: CONFLICT CIVIL UNREST ENVIRONMENT IMAGES OF THE DAY) 

Sand blows across the coastal highway near Brega in eastern Libya, April 1, 2011. The exact position of the front line is difficult to know in a war of rapid movements in both directions across open desert, but one constant is the presence of the road, along which Libya?s revolution has travelled, back and forth as each side advances and retreats across vast distances, leaving behind a wake of destruction and death. Picture taken April 1, 2011. REUTERS/Finbarr O'Reilly (LIBYA - Tags: CONFLICT CIVIL UNREST POLITICS IMAGES OF THE DAY) 

Children are engulfed in dust as a convoy of escorted taxis carrying Muslims, fleeing the continuing sectarian violence, arrives at a temporary internally displaced person (IDP) camp at the airport of the capital Bangui January 30, 2014. The IDPs will be then processed for air evacuation to different countries in Africa. REUTERS/Siegfried Modola (CENTRAL AFRICAN REPUBLIC - Tags: CONFLICT POLITICS TPX IMAGES OF THE DAY) 

A dust storm blankets Sydney's iconic Opera House at sunrise September 23, 2009. A huge outback dust storm swept eastern Australia and blanketed Sydney on Wednesday, disrupting transport, forcing people indoors and stripping thousands of tonnes of valuable farmland topsoil. REUTERS/Tim Wimborne (AUSTRALIA ENVIRONMENT IMAGES OF THE DAY) 

A woman covers her face against a sandstorm on a street in Tianjin municipality March 20, 2010. Tonnes of sand from deserts in China's interior blew into Beijing on Saturday, shrouding China's capital in a yellow-orange haze that authorities warned made the air quality "hazardous". REUTERS/Vincent Du(CHINA - Tags: ENVIRONMENT IMAGES OF THE DAY) 

Two people look at the scene of a multiple vehicle collisions along Interstate-10 during a dust storm near Casa Grande, Arizona, December 22, 2009. Several motorists were dead as others were rushed to local hospitals. REUTERS/Joshua Lott (UNITED STATES - Tags: TRANSPORT DISASTER IMAGES OF THE DAY) 

Men ride a motorcycle through a heavy dust storm along a road in Greater Noida on the outskirts of New Delhi October 23, 2012. REUTERS/Vivek Prakash (INDIA - Tags: ENVIRONMENT SOCIETY TRANSPORT) 

A gold mine worker takes shelter from a sandstorm in Al-Ibedia locality at River Nile State, July 30, 2013. REUTERS/Mohamed Nureldin Abdallah (SUDAN - Tags: SOCIETY BUSINESS EMPLOYMENT COMMODITIES ENVIRONMENT) 

A Kurdish Syrian refugee covers her face as she waits for transport during a sand storm on the Turkish-Syrian border near the southeastern town of Suruc in Sanliurfa province, September 24, 2014. The United Nations refugee agency said on Tuesday it was making contingency plans in case all 400,000 inhabitants of the Syrian Kurdish town of Kobani fled into Turkey to escape advancing Islamic State militants. REUTERS/Murad Sezer (TURKEY - Tags: POLITICS TPX IMAGES OF THE DAY CIVIL UNREST CONFLICT)

Tiananmen Square is seen amid a sandstorm in Beijing March 20, 2010. A severe sandstorm that plagued northwestern China in the past few weeks arrived in Beijing Friday night, packing strong winds and tonnes of sand, Xinhua News Agency said. REUTERS/Grace Liang (CHINA - Tags: ENVIRONMENT IMAGES OF THE DAY) 

Hindu devotees endure a dust storm while heading towards the Shri Hinglaj Mata Temple in Pakistan's Balochistan province April 24, 2011. Thousands from Pakistan and India take part in the annual pilgrimage to the temple, which is a revered site for Hindus. Picture taken April 24, 2011. REUTERS/Akhtar Soomro (PAKISTAN - Tags: RELIGION SOCIETY) 

An internally displaced man, who fled a military offensive in the Swat valley region, sits outside his family tent during a dust storm at the UNHCR (United Nations High Commission for Refugees) Jalozai camp, about 140 km (87 miles) north west of Pakistan's capital Islamabad July 2, 2009. The looming arrival of monsoon rains in Pakistan threatens to bring more misery to the nearly 2 million people displaced by the government's battle with militants in the northwest, U.N. officials said on Thursday.
REUTERS/Akhtar Soomro (PAKISTAN CONFLICT POLITICS SOCIETY IMAGES OF THE DAY ENVIRONMENT) 

A mosque is seen through the haze of a morning sand storm in central Cairo March 22, 2013. REUTERS/Russell Boyce (EGYPT - Tags: ENVIRONMENT CITYSCAPE SOCIETY)