2019 No https://pubmed.ncbi.nlm.nih.gov/31692140/ García-Hernández, Celia Europe Opinion Students Air pollution Children Microenvironments Personal exposure Systematic review Ultrafine particles The characteristics of the microenvironments with the greatest levels of UFP were being close to heavy traffic or near cooking and cleaning activities. This review revealed the wide differences in exposure assessment methodologies that could lead to a lack of uniform and comparable information about the real UFP exposure in children.