It is the tenth duststorm since mid-April to hit Iraq, which has been battered by soil degradation, intense droughts and low rainfall linked to climate change.

Earlier this month, to mark World Environment Day, President Barham Saleh warned that tackling climate change "must become a national priority for Iraq as it is an existential threat to the future of our generations to come".

On Monday morning, a thick white dust covered the Iraqi capital and surroundings areas, with visibility slashed to a few hundred metres (yards).

Officials at Baghdad airport announced the temporary suspension of flights.

In Najaf, a Shiite holy city in central Iraq, the airport briefly suspended operations in the morning before reopening a few hours later when the dust passed.

Airports have been forced to suspend flights several times due to sandstorms in recent weeks.

In May, sandstorms sent thousands of people to hospital with respiratory problems, and left one person dead.

Iraq, which is entering the scorching summer season when temperatures at times surpass 50 degrees Celsius (122 Fahrenheit), is ranked by the United Nations as one of the world's five most vulnerable nations to climate change and desertification.

The environment ministry has warned that over the next two decades Iraq could endure an average of 272 days of sandstorms per year, rising to above 300 by 2050.