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In the study of air pollution, a critical load is defined as "a quantitative estimate of an exposure to one or more pollutants below which significant harmful effects on specified sensitive elements of the environment do not occur according to present knowledge". The history, terminology, and approach used to calculate critical loads differ by region and country. The differences between approaches used by European countries and in the U.S. are discussed below.

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rdfs:label	Critical load (en)
rdfs:comment	In the study of air pollution, a critical load is defined as "a quantitative estimate of an exposure to one or more pollutants below which significant harmful effects on specified sensitive elements of the environment do not occur according to present knowledge". The history, terminology, and approach used to calculate critical loads differ by region and country. The differences between approaches used by European countries and in the U.S. are discussed below. (en)
dct:subject	Air pollution
Wikipage page ID	13265453 (xsd:integer)
Wikipage revision ID	981088640 (xsd:integer)
Link from a Wikipage to another Wikipage	Cartesian coordinate system Biodiversity loss United Nations Economic Commission for Europe Soil acidification Pollutant Air pollution Convention on Long-Range Transboundary Air Pollution Competition (biology) Steady state Non-methane volatile organic compound Cation Tropospheric ozone Air pollution Aluminium dbr:Ammonia Ecosystem services Nitrogen oxide Ozone PH Forest Atmosphere of Earth Abundance (ecology) Acid Sulfur dbr:Sulfur_dioxide Ecosystem Fertilizer National Atmospheric Deposition Program Natural environment Estuary Toxic algal bloom Eutrophication Multi-effect Protocol Critical level Species composition Nitrogen pollution dbr:LRTAP dbr:Simple_Mass_Balance
Link from a Wikipage to an external page	http://nadp.slh.wisc.edu/committees/clad/ http://www.mnp.nl/cce/ https://www.nature.nps.gov/air/ https://web.archive.org/web/20170310100303/http:/nadp.sws.uiuc.edu/ https://web.archive.org/web/20170324035941/http:/nadp.sws.uiuc.edu/committees/clad/ https://www.epa.gov/criteria-air-pollutants/naaqs-table https://www.epa.gov/environmental-topics/air-topics https://www.fs.fed.us/air/ https://www.fws.gov/refuges/AirQuality/index.html
sameAs	Critical load Critical load Critical load Critical load Critical load
Link from a Wikipa... related subject.	Planetary boundaries
has abstract	In the study of air pollution, a critical load is defined as "a quantitative estimate of an exposure to one or more pollutants below which significant harmful effects on specified sensitive elements of the environment do not occur according to present knowledge". Air pollution research in relation to critical loads has focused on nitrogen and sulfur pollutants. After these pollutants are emitted into the atmosphere, they are subsequently deposited into ecosystems. Both sulfur and nitrogen deposition can acidify surface waters and soils. As added acidity lowers the pH of water, fish and invertebrate health are negatively impacted. Sulfur and nitrogen, as acidifying agents, may change soil nutrient content by removing calcium and releasing toxic aluminum, further impacting plants and animals. Nitrogen deposition can also act as a fertilizer in the environment and alter the competitive interactions of plants, thereby favoring the growth of some plant species and inhibiting others, potentially leading to changes in species composition and abundance. The deposition of nitrogen contributes to nutrient enrichment in freshwater, coastal, and estuarine ecosystems, which may cause toxic algal blooms, fish kills, and loss of biodiversity. Air pollutants impact essential ecosystem services such as air and water purification, decomposition and detoxification of waste materials, and climate regulation. When deposition is greater than the critical load of a pollutant for a particular location, it is considered a critical load exceedance, meaning the biota are at increased risk of ecological harm. Some components of an ecosystem are more sensitive to deposition than others; therefore, critical loads can be developed for a variety of ecosystem components and responses, including (but not limited to) shifts in diatoms, increases in invasive grass species, changes in soil chemistry, decreased forest health, altered and reduced biodiversity, and lake and stream acidification. The history, terminology, and approach used to calculate critical loads differ by region and country. The differences between approaches used by European countries and in the U.S. are discussed below. (en)
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page length (characters) of wiki page	12986 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Critical_load
is Link from a Wikipage to another Wikipage of	Convention on Long-Range Transboundary Air Pollution Air pollution Ecological threshold National Atmospheric Deposition Program Critical loads
is Wikipage redirect of	Critical loads
is foaf:primaryTopic of	wikipedia-en:Critical_load

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