# Japan general-environment limit, 30–300 MHz

> 27.5 V/m, equivalently 0.2 mW/cm² (2 W/m²), across FM, VHF TV and the 150–300 MHz land-mobile bands, averaged over six minutes.

- Canonical URL: https://emfbase.com/limits/japan-general-environment-limit-30-300-mhz
- Collection: Exposure limits
- Record id: `limits:japan-public-30-300mhz`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/limits/japan-general-environment-limit-30-300-mhz

## Key values

- **Limit value:** 27.5 V/m — Regulatory value — legally enforceable — 電波法施行規則 appended table 2-3-2, table 1: E = 27.5 V/m, H = 0.0728 A/m, power flux density 0.2 mW/cm² = 2 W/m². Where several stations transmit at one site, the sum of the squared ratios to each band's value must not exceed 1. [japan-radio-law-table]
- **Quantity:** electric field strength
- **Frequency band:** 30–300 MHz
- **Population:** general public
- **Set by:** Japan Radio Radiation Protection Guidelines (電波防護指針) (Radio Radiation Protection Guidelines 1990/1997; enforced through 電波法施行規則 art. 21-3 and appended table 2-3-2 (as amended 2017))
- **Kind:** Regulatory — legally enforceable
- **Averaging time:** 6 minutes — A measurement must use the same averaging before it can be compared with this value.

## Related records

- [Japan Radio Radiation Protection Guidelines (電波防護指針)](https://emfbase.com/standards/japan-radio-radiation-protection-guidelines): Japan's radio-wave protection values, made binding by the Radio Law Enforcement Regulations: 27.5 V/m from 30 to 300 MHz and 61.4 V/m above 1.5 GHz for the general environment, six-minute averaged.
- [ICNIRP 2020 general public reference level, 400 MHz–2 GHz](https://emfbase.com/limits/icnirp-public-reference-level-400-2000-mhz): Frequency-scaled reference level f/200 W/m², giving 4.5 W/m² at 900 MHz and 9 W/m² at 1800 MHz.

## Sources

- `japan-radio-law-table` 総務省 電波利用ポータル (Ministry of Internal Affairs and Communications, Japan). *電波法施行規則 第21条の3 および別表第2号の3の2 — 電波の強度の値 (Radio Law Enforcement Regulations, art. 21-3 and appended table 2-3-2: permitted radio-wave field strengths)*. https://www.tele.soumu.go.jp/j/sys/ele/medical/system/laws/index.htm — regulation, link checked 2026-08-12

Data licence: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Dataset version 2026.08.1. Retrieved from EMFBase, https://emfbase.com.

This record is reference data, not medical or legal advice. Regulatory limits, scientific guidelines and precautionary values are labelled separately and answer different questions.