Closely tied to the brown cloud, yellow dust consists of huge masses of windblown dust and sand that afflict parts of the world each year. The most common yellow dust phenomenon begins with winds over deserts in Mongolia and China spreading east across China and affecting the Korean peninsula, Japan, and even Russia's Pacific port of Vladivostok. In its movement across China's industrial areas, the yellow dust mixes with the brown cloud of air pollutants to produce a highly noxious brew of very unpleasant air. Yellow dust is most prevalent in China from March until May. Deforestation and desertification, probably aggravated by global warming are contributing to the yellow dust phenomenon.