How AI is applied across API Evangelist and APIs.io. Read my AI disclosure →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

EPA — U.S. Environmental Protection Agency Quarterly Data API

Quarterly aggregated values.

EPA — U.S. Environmental Protection Agency Quarterly Data API is one of 137 APIs that EPA — U.S. Environmental Protection Agency publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

This API exposes 1242 JSON Schema definitions.

Tagged areas include Quarterly Data. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and 1242 JSON Schemas.

This API exposes 5 operations across 5 paths, and defines 2 schemas. It is described by OpenAPI 3.2.0, at version 1.0.

Requests are made against a single base URL, https://aqs.epa.gov/data/api.

5 operations 5 paths 2 schemas 5 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.0
Base URL
https://aqs.epa.gov/data/api
Authentication
API Key
Resource Areas
1

Authentication & Security 1

EPA — U.S. Environmental Protection Agency Quarterly Data API declares 1 security scheme for authenticating requests. An API key is passed in the query as key (emailKey). By default, every request must be authenticated.

  • emailKey — AQS requires email and key query parameters on every request. Register at /signup?email=YOUREMAIL to receive a key by email.

Paths & Operations 5

Across 5 paths, the API surfaces 5 operations — 5 GET. Each is listed below with its method, path, parameters, and response codes.

Quarterly Data 5

Quarterly aggregated values.

GET
/quarterlyData/bySite
Get Quarterly Data by Site
quarterlyDataBySite 10 params → 200
GET
/quarterlyData/byCounty
Get Quarterly Data by County
quarterlyDataByCounty 9 params → 200
GET
/quarterlyData/byState
Get Quarterly Data by State
quarterlyDataByState 8 params → 200
GET
/quarterlyData/byBox
Get Quarterly Data by Bounding Box
quarterlyDataByBox 11 params → 200
GET
/quarterlyData/byCBSA
Get Quarterly Data by CBSA
quarterlyDataByCBSA 8 params → 200

Schemas 2

The contract defines 2 schemas that model the data the API accepts and returns. The most detailed are Header (5 properties), Envelope (2 properties). Each schema is shown below with its type and property counts.

Header
object
5 properties
Envelope
object
2 properties 2 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

epa-quarterly-data-api-openapi.yml Raw ↑

Other APIs EPA — U.S. Environmental Protection Agency publishes across the network.

EPA Facility Registry Service (FRS) API
EPA TRI (Toxics Release Inventory) Web Service
EPA ATTAINS Web Services
EPA WATERS — Watershed Assessment, Tracking & Environmental Results
EPA Grants API
EPA Insect Repellents API
EPA e-Manifest Hazardous Waste Tracking
EPA System of Registries (SoR)
CTX — Center for Computational Toxicology and Exposure APIs
EPA — U.S. Environmental Protection Agency Account Type Codes API
EPA — U.S. Environmental Protection Agency Accounts API
EPA — U.S. Environmental Protection Agency Air Emission Testing API
Where this information came from

This is an independent, third-party profile of EPA — U.S. Environmental Protection Agency Quarterly Data API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.