To understand the sources and migration pattern of PM2. 5 in the Yangtze River Delta (YRD). China. the total carbon (TC) and total nitrogen (TN) concentrations and the corresponding stable isotope ratios (δ13CTC and δ15NTN) were determined in aerosol samples simultaneously collected from August 2014 to April 2015 at three different locations (Shanghai. https://cosmeticssquadets.shop/product-category/corrective-skin-peels/