Layers:

Layer: AirNow24Hr_Ozone (0)


Name: AirNow24Hr_Ozone

Display Field: Id

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This United States Environmental Protection Agency (US EPA) feature layer represents interpolated contour surfaces based on updated hourly Air Quality Index (AQI) values for the last 24 hours. The interpolated surfaces are for Ozone (O3) and currently for the US only. The source of this feature layer is from a GRIB2 file located here.Please note, the values within the Gridcode field correlate to the following AQI Categories:1 = AQI Category: "Good"2 = AQI Category: "Moderate"3 = AQI Category: "Unhealthy for Sensitive Groups"4 = AQI Category: "Unhealthy"5 = AQI Category: "Very Unhealthy"6 = AQI Category: "Hazardous"Map and forecast data are collected using federal reference or equivalent monitoring techniques or techniques approved by the state, local or tribal monitoring agencies. To maintain "real-time" maps, the data are displayed after the end of each hour. Although preliminary data quality assessments are performed, the data in AirNow are not fully verified and validated through the quality assurance procedures monitoring organizations used to officially submit and certify data on the EPA Air Quality System (AQS).This data sharing, and centralization creates a one-stop source for real-time and forecast air quality data. The benefits include quality control, national reporting consistency, access to automated mapping methods, and data distribution to the public and other data systems. The U.S. Environmental Protection Agency, National Oceanic and Atmospheric Administration, National Park Service, tribal, state, and local agencies developed the AirNow system to provide the public with easy access to national air quality information. State and local agencies report the Air Quality Index (AQI) for cities across the US and parts of Canada and Mexico. AirNow data are used only to report the AQI, not to formulate or support regulation, guidance or any other EPA decision or position.

Copyright Text: US EPA, Office of Air and Radiation, Office of Air Quality Planning and Standards (OAQPS)

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

XMin: -14428435
YMin: 2271698
XMax: -6625635
YMax: 8408178
Spatial Reference: 102100 (3857)


Drawing Info:

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HasZ: false

HasM: false

Time Info:

Start Time Field: Timestamp
End Time Field: null
Track ID Field: null
Time Extent
[5/27/2026 3:00:00 AM UTC, 5/28/2026 4:00:00 AM UTC]

Time Reference: UTC
Time Interval: 0
Time Interval Units:
Has Live Data: false
Export Options:

Use Time: false
Time Data Cumulative: false
Time Offset: 0
Time Offset Units: esriTimeUnitsCenturies

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: OBJECTID

Unique ID Field:

Name : OBJECTID

IsSystemMaintained : True


Global ID Field:

Type ID Field: gridcode

Fields:
• OBJECTID (type: esriFieldTypeOID, alias: OBJECTID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
• Id (type: esriFieldTypeInteger, alias: Id, SQL Type: sqlTypeOther, nullable: true, editable: true)
• gridcode (type: esriFieldTypeInteger, alias: gridcode, SQL Type: sqlTypeOther, nullable: true, editable: true)
• Timestamp (type: esriFieldTypeDate, alias: Timestamp, SQL Type: sqlTypeOther, length: 8, nullable: true, editable: true)
• Unixtime (type: esriFieldTypeInteger, alias: Unixtime, SQL Type: sqlTypeOther, nullable: true, editable: true)
• Shape__Area (type: esriFieldTypeDouble, alias: Shape__Area, SQL Type: sqlTypeDouble, nullable: true, editable: false)
• Shape__Length (type: esriFieldTypeDouble, alias: Shape__Length, SQL Type: sqlTypeDouble, nullable: true, editable: false)

Types:

ID: 1
Name: Good
Domains:

Templates:

Name: Good
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

• gridcode: 1

---

ID: 2
Name: Moderate
Domains:

Templates:

Name: Moderate
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

• gridcode: 2

---

ID: 3
Name: Unhealthy for Sensitive Groups
Domains:

Templates:

Name: Unhealthy for Sensitive Groups
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

• gridcode: 3

---

ID: 4
Name: Unhealthy
Domains:

Templates:

Name: Unhealthy
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

• gridcode: 4

---

ID: 5
Name: Very Unhealthy
Domains:

Templates:

Name: Very Unhealthy
Description:
Drawing Tool: esriFeatureEditToolPolygon
Prototype:

Attributes:

• gridcode: 5

---

ID: 6
Name: Hazardous
Domains:

Templates:

Name: Hazardous
Description:
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Prototype:

Attributes:

• gridcode: 6

---


Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 5/28/2026 4:29:52 AM

Schema Last Edit Date: 5/28/2026 4:29:52 AM

Data Last Edit Date: 5/28/2026 4:27:29 AM