china or in the east coast of the united states or even in europe where a lot of these pollutants are limited and transported and then finally the writer colors that we have correspond to dust storms and so in that case what we're looking at is the effect of the surface winds blowing across a region that has a lot of fine particles that can be blown up into the air and blown by the winds over a very long distances. using models like this help scientists understand what's happening in the earth's atmosphere. other projects concentrate on collecting actual data about atmospheric particles dr robert levy has been working on a long time global aerosol record. so this is so that the time series of from the motive to chair a satellite we are trying to create a global observations of aerosol these are not models either based on camera like images how it works is satellites measure light reflected from the earth and you