<?xml version="1.0" encoding="utf-8"?><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcterms="http://purl.org/dc/terms/"><dc:title xml:lang="en">particulate matter</dc:title><dc:identifier>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31320449</dc:identifier><dc:language>en</dc:language><dc:publisher xml:lang="en">Getty Institute</dc:publisher><dcterms:created>2026-03-30 20:26:22</dcterms:created><dcterms:isPartOf xsi:type="dcterms:URI">http://AATesaurus.cultura.gencat.cat/aat/getty_en</dcterms:isPartOf><dcterms:isPartOf xml:lang="en">Tesaurus d&apos;Art i Arquitectura</dcterms:isPartOf><dc:format>text/html</dc:format> <dcterms:alternative xml:lang="en">PM</dcterms:alternative> <dcterms:alternative xml:lang="en">matter, particulate</dcterms:alternative> <dcterms:alternative xml:lang="en">particle pollution</dcterms:alternative> <dc:description xml:lang="en"><![CDATA[ Extremely small particles and droplets suspended in air. They may include organic chemicals, acids, metals, and dust or soil particles. Also known as particle pollution, particulate matter is used as a measure of air pollution. The EPA  groups inhalable pollutants which pass through the throat and nose and enter the lungs into two categories: “inhalable coarse particles” (between 2.5 micrometers and 10 micrometers in diameter); and “fine particles” (2.5 micrometers in diameter and smaller).  ]]></dc:description></metadata>