given its tourismoriented economy the city has also set up a mobile app which informs both tourists and locals of what to do in phuket to illustrate this trend outdoor concentrations of fine particulate matter pmjs which is hazardous to health is commonly used as a proxy measure of pollution practically all urban residents in the region are exposed to ambient air pollution exceeding the who guidelines on the concentration of fine particulate ambient air pollution ie pm pgm only of urban residents in emerging asia live in areas with pollution concentrations at or below this level figure