Defines the unit used to measure the pollutant's concentration. To determine the default unit of concentration for a given pollutant, refer to the table in Reported pollutants.
Enums
UNIT_UNSPECIFIED
Unspecified concentration unit.
PARTS_PER_BILLION
The ppb (parts per billion) concentration unit.
MICROGRAMS_PER_CUBIC_METER
The "µg/m^3" (micrograms per cubic meter) concentration unit.
AdditionalInfo
The emission sources and health effects of a given pollutant.
JSON representation
{"sources": string,"effects": string}
Fields
sources
string
Text representing the pollutant's main emission sources.
effects
string
Text representing the pollutant's main health effects.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-27 UTC."],[[["\u003cp\u003eThe Air Quality Pollutant data provides information about a specific pollutant, including its code, display name, full name, concentration, and additional information.\u003c/p\u003e\n"],["\u003cp\u003ePollutant concentration is measured using standardized units like parts per billion (ppb) or micrograms per cubic meter (µg/m^3) and includes a numerical value representing the concentration level.\u003c/p\u003e\n"],["\u003cp\u003eAdditional information about the pollutant includes details about its main emission sources and potential health effects.\u003c/p\u003e\n"],["\u003cp\u003eThe pollutant's code name can be used to identify it and find more information about it in the reported pollutants documentation.\u003c/p\u003e\n"],["\u003cp\u003ePollutant concentration is measured and reported using standard units.\u003c/p\u003e\n"]]],["This data defines air quality pollutants, detailing their properties and measurement. Each pollutant has a `code`, `displayName`, and `fullName`. The `concentration` is measured with `units` and a `value`. Units can be `PARTS_PER_BILLION` or `MICROGRAMS_PER_CUBIC_METER`. `AdditionalInfo` includes `sources` of emission and the pollutant's `effects` on health. This data includes information on specific pollutant names, concentration data, and related information.\n"],null,["# Pollutant\n\n- [JSON representation](#SCHEMA_REPRESENTATION)\n- [Concentration](#Concentration)\n - [JSON representation](#Concentration.SCHEMA_REPRESENTATION)\n- [Unit](#Unit)\n- [AdditionalInfo](#AdditionalInfo)\n - [JSON representation](#AdditionalInfo.SCHEMA_REPRESENTATION)\n\nData regarding an air quality pollutant.\n\n| JSON representation |\n|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| ``` { \"code\": string, \"displayName\": string, \"fullName\": string, \"concentration\": { object (/maps/documentation/air-quality/reference/rest/v1/Pollutant#Concentration) }, \"additionalInfo\": { object (/maps/documentation/air-quality/reference/rest/v1/Pollutant#AdditionalInfo) } } ``` |\n\n| Fields ||\n|------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `code` | `string` The pollutant's code name (for example, \"so2\"). For a list of supported pollutant codes, see [Reported pollutants](/maps/documentation/air-quality/pollutants#reported_pollutants). |\n| `displayName` | `string` The pollutant's display name. For example: \"NOx\". |\n| `fullName` | `string` The pollutant's full name. For chemical compounds, this is the IUPAC name. Example: \"Sulfur Dioxide\". For more information about the IUPAC names table, see \u003chttps://iupac.org/what-we-do/periodic-table-of-elements/\u003e. |\n| `concentration` | `object (`[Concentration](/maps/documentation/air-quality/reference/rest/v1/Pollutant#Concentration)`)` The pollutant's concentration level measured by one of the standard air pollutation measure units. |\n| `additionalInfo` | `object (`[AdditionalInfo](/maps/documentation/air-quality/reference/rest/v1/Pollutant#AdditionalInfo)`)` Additional information about the pollutant. |\n\nConcentration\n-------------\n\nThe concentration of a given pollutant in the air.\n\n| JSON representation |\n|---------------------------------------------------------------------------------------------------------------|\n| ``` { \"units\": enum (/maps/documentation/air-quality/reference/rest/v1/Pollutant#Unit), \"value\": number } ``` |\n\n| Fields ||\n|---------|---------------------------------------------------------------------------------------------------------------------------------------|\n| `units` | `enum (`[Unit](/maps/documentation/air-quality/reference/rest/v1/Pollutant#Unit)`)` Units for measuring this pollutant concentration. |\n| `value` | `number` Value of the pollutant concentration. |\n\nUnit\n----\n\nDefines the unit used to measure the pollutant's concentration. To determine the default unit of concentration for a given pollutant, refer to the table in [Reported pollutants](/maps/documentation/air-quality/pollutants#reported_pollutants).\n\n| Enums ||\n|------------------------------|----------------------------------------------------------------|\n| `UNIT_UNSPECIFIED` | Unspecified concentration unit. |\n| `PARTS_PER_BILLION` | The ppb (parts per billion) concentration unit. |\n| `MICROGRAMS_PER_CUBIC_METER` | The \"µg/m\\^3\" (micrograms per cubic meter) concentration unit. |\n\nAdditionalInfo\n--------------\n\nThe emission sources and health effects of a given pollutant.\n\n| JSON representation |\n|--------------------------------------------------|\n| ``` { \"sources\": string, \"effects\": string } ``` |\n\n| Fields ||\n|-----------|-------------------------------------------------------------------|\n| `sources` | `string` Text representing the pollutant's main emission sources. |\n| `effects` | `string` Text representing the pollutant's main health effects. |"]]
