Spatial distribution and sources identification of elements in PM2.5 among the coastal city group in the Western Taiwan Strait region, China

► Elements in PM2.5 among the city group in the Western Taiwan Strait were studied. ► PCA and CA results indicated that multi-sources contributed to the elements. ► Elements were abundant in several fast growing locations. ► Elements were much highly enriched at the northern sites than the southern sites. ► Air masses from the Northern China might elevate the element concentration.