---
title: "Look up emission factors by latitude/longitude"
method: GET
path: "/api/lookup/by-coordinates"
---

# Look up emission factors by latitude/longitude

`GET /api/lookup/by-coordinates`

## Request

- Base URL: `https://emission-factors.com`
- URL: `https://emission-factors.com/api/lookup/by-coordinates`
- Auth: none declared

## Query parameters

- `lat` number, required
- `lon` number, required

## Response `200`

Resolved ZIP and emission factors

## Other responses

- `400`: Invalid coordinates
- `404`: No ZCTA at these coordinates
- `503`: Census Geocoder unavailable; retry

---

[API](https://skmtc.dev/emission-factors/apis/emission-factors-com-api.md) · [All operations](https://skmtc.dev/emission-factors/apis/emission-factors-com-api/llms.txt) · [OpenAPI document](https://skmtc.dev/emission-factors/apis/emission-factors-com-api/revisions/6a306ef2044a?raw)