# EMFBase

> A structured, cited directory of electromagnetic field data: exposure limits by standard and country, unit conversions, typical field strengths and safe-distance estimates for everyday emitters, measurement protocols, meters, shielding materials, and the research record. Every record is available as HTML, Markdown, JSON, and bulk export.

Dataset version 2026.08.1, records last verified 12 August 2026. Licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/).

Every page has a Markdown twin at the same path with `.md` appended, and a JSON record under `/api`. Values carry their unit, basis, frequency band, averaging time and citation. Regulatory limits, scientific guidelines and precautionary values are labelled distinctly and are never mixed in one number.

## Start here

- [Exposure limits by standard](https://emfbase.com/limits): numeric limits with quantity, band, population, averaging time and citation.
- [Sources and emitters](https://emfbase.com/emitters): transmit power, duty cycle, field strength by distance, mitigations.
- [Quantities, units and conversions](https://emfbase.com/quantities): exact factors and the far-field formulas relating them.
- [Device SAR](https://emfbase.com/devices): declared maximum SAR per phone model, at the ear and on the body, averaged over 10 g of tissue.
- [Direct answers](https://emfbase.com/questions): short cited answers to the most common EMF questions.
- [Measurement protocols](https://emfbase.com/protocols): reproducible procedures and their pitfalls.
- [Research record](https://emfbase.com/studies): what each key study found and what it cannot establish.

## Machine interfaces

- [OpenAPI description](https://emfbase.com/api/openapi.json): every collection and record endpoint.
- [MCP endpoint](https://emfbase.com/api/mcp): typed tools for search, records, limits, unit conversion and distance estimates.
- [Dataset manifest](https://emfbase.com/api/manifest.json): collections, counts, licence, version.
- [Bulk export](https://emfbase.com/export/emfbase.json): the whole dataset in one file, with CSV per collection under `/export`.
- [Changes feed](https://emfbase.com/feed.json): JSON Feed of record updates.

## Collections

- [Standards & frameworks](https://emfbase.com/standards): The bodies and documents that set exposure values, separated into legally enforceable regulation, scientific guidelines, and precautionary frameworks. Index in Markdown: https://emfbase.com/standards.md
- [Exposure limits](https://emfbase.com/limits): Individual numeric exposure limits and precautionary values, each with its quantity, unit, frequency band, averaging time, population and citation. Index in Markdown: https://emfbase.com/limits.md
- [Quantities & units](https://emfbase.com/quantities): The physical quantities used in EMF work, their units, exact conversion factors, and the formulas relating them. Index in Markdown: https://emfbase.com/quantities.md
- [Sources & emitters](https://emfbase.com/emitters): Everyday EMF sources with emission bands, transmit power, duty cycle, field strength by distance, and mitigations ordered by effectiveness. Index in Markdown: https://emfbase.com/emitters.md
- [Instruments](https://emfbase.com/meters): Measurement instrument classes: what each detects, what it cannot detect, the band it covers, and the criteria that separate a usable instrument from a toy. Index in Markdown: https://emfbase.com/meters.md
- [Shielding & remediation](https://emfbase.com/shielding): Shielding material classes and remediation measures with datasheet attenuation, grounding requirements, and documented failure modes. Index in Markdown: https://emfbase.com/shielding.md
- [Research record](https://emfbase.com/studies): Key studies and hazard classifications, each stating what was found, what it can and cannot establish, and where it sits in the evidence base. Index in Markdown: https://emfbase.com/studies.md
- [Organizations](https://emfbase.com/organizations): Regulators, standards bodies, health authorities, certifying institutes and advocacy groups, with jurisdiction and role. Index in Markdown: https://emfbase.com/organizations.md
- [Measurement protocols](https://emfbase.com/protocols): Reproducible measurement procedures: goal, equipment, ordered steps, pitfalls, and the limits to interpret results against. Index in Markdown: https://emfbase.com/protocols.md
- [Glossary](https://emfbase.com/glossary): Definitions of the physics, regulatory, measurement and health terms used throughout the dataset. Index in Markdown: https://emfbase.com/glossary.md
- [Device SAR](https://emfbase.com/devices): Declared maximum SAR per phone model, at the ear and worn on the body, as published by the German Federal Office for Radiation Protection. These are the manufacturers' own compliance declarations averaged over 10 g of tissue, not independent measurements. Index in Markdown: https://emfbase.com/devices.md
- [Direct answers](https://emfbase.com/questions): Frequently asked EMF questions with short, cited, quotable answers linked to the underlying records. Index in Markdown: https://emfbase.com/questions.md

## Citing

Cite a record by its canonical URL and record id, for example `limits:fcc-sar-partial-body` at https://emfbase.com/limits/fcc-sar-limit-phones. Each record lists the primary documents it derives from with the date the link was last checked. This dataset is reference data, not medical or legal advice.