Property talk:P2404

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time-weighted average exposure limit
recommended or required concentration limit for chemical exposure in a workplace in a given work day

Description	recommended or required concentration limit for chemical exposure in a workplace in a given work day
Represents	time-weighted average concentration (Q21010836)
Data type	Quantity
Domain	According to this template: chemicals According to statements in the property: chemical substance (Q79529) When possible, data should only be stored as statements
Allowed values	According to this template: any number with a concentration measurement such as gram per litre (Q834105); duration (i.e. length of workday used in measurement) applies to jurisdiction (P1001) as qualifier for legally defined limits (explicitly set to "none" for recommendations known to be non-binding) According to statements in the property: 0 ≤ 𝓧 ≤ 1,000 When possible, data should only be stored as statements
Allowed units	gram per litre (Q834105), millilitre per litre (Q21075844), milligram per cubic metre (Q21077820) or parts per million (Q21006887)
Example	According to this template: acetone (Q49546) → 0.0024 gram per litre (Q834105); applies to jurisdiction (P1001) → United States of America (Q30); duration → 10 hour (Q25235) According to statements in the property: acetone (Q49546) → 590 milligram per cubic metre When possible, data should only be stored as statements
Source	NIOSH pocket guide to chemical hazards, 2005 edition, 3rd printing (Q20022913) for U.S. values; potentially other sources as well (note: this information should be moved to a property statement; use property source website for the property (P1896))
Robot and gadget jobs	Part of mass importation of the Pocket Guide to Chemical Hazards into Wikidata.
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Chart by item creation date Minimum and maximum Items with highest numeric value Items with lowest numeric value Database reports/Constraint violations/P2404 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 862 Main statement 860 99.8% of uses Qualifier 2 0.2% of uses

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Type “chemical substance (Q79529)”: item must contain property “subclass of (P279)” with classes “chemical substance (Q79529)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2404#Type Q79529, SPARQL

Required qualifier “duration (P2047)”: this property should be used with the listed qualifier. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2404#mandatory qualifier, SPARQL

Qualifiers “applies to jurisdiction (P1001), duration (P2047), route of administration (P636), reason for deprecated rank (P2241), reason for preferred rank (P7452)”: this property should be used only with the listed qualifiers. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2404#allowed qualifiers, SPARQL

Units: “gram per litre (Q834105), millilitre per litre (Q21075844), milligram per cubic metre (Q21077820), parts per million (Q21006887)”: value unit must be one of listed. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2404#Units

Range from “0” to “1000”: values should be in the range from “0” to “1000”. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2404#Range

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

List of violations of this constraint: Database reports/Constraint violations/P2404#Scope, hourly updated report, SPARQL

Citation needed: the property must have at least one reference (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2404#citation needed

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2404#Entity types

This property is being used by: ca:Plantilla:Infotaula de roca, ca:Plantilla:Infotaula compost químic eu:Txantiloi:Konposatu kimiko infotaula/probak, eu:Txantiloi:Konposatu kimiko infotaula ha:Template:Infobox chemical incubator:Template:Wp/shi/Infobox chemical kab:Talɣa:Infobox chemical shi:Talɣa:Infobox chemical ga:Teimpléad:WD Bosca Sonraí Comhdhúil Cheimiceach ff:Template:Infobox chemical gv:Clowan:WD Kishtey Fys Co-vunstoo Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)