undecided investment, which by determining their task and creating better export conditions , bakhtiari coal import nodedav and sima news agency, reducing rainfall , increasing temperature and after that, soil erosion has caused the formation of dust phenomenon in recent years. in addition to the presence of 30 million hectares of dust centers in iran , there are more than 270 million hectares of dust centers in the countries of southwest asia and north africa. one of the solutions to deal with the phenomenon of dust, they know that the air is very bad, there is no other way to breathe dust, i have to go outside, the increase in the phenomenon of fine dust that has occurred in different regions of the country following climate changes and droughts of the past decade , is now an opportunity and it is not limited to certain years or years. dust started in north africa and sometimes it is transported by mid-level currents except to iran. what changes in one area also affects distant areas . our recent studies show that the severity of desertification land degradation. at least one million, a 4% increase th