# Japan general-environment limit, 300 MHz–1.5 GHz

> f/1500 mW/cm² (f in MHz) — 6 W/m² at 900 MHz, the band that carries most 2G/3G/4G downlink in Japan.

- Canonical URL: https://emfbase.com/limits/japan-general-environment-limit-300-1500-mhz
- Collection: Exposure limits
- Record id: `limits:japan-public-300-1500mhz`
- Status: verified
- Last verified: 2026-08-12
- JSON: https://emfbase.com/api/limits/japan-general-environment-limit-300-1500-mhz

## Key values

- **Limit value:** 2,000,000–1 × 10^7 µW/m² — Regulatory value — legally enforceable — The range is the band edges: 0.2 mW/cm² (2 W/m²) at 300 MHz to 1 mW/cm² (10 W/m²) at 1.5 GHz. At 900 MHz the limit is 0.6 mW/cm² = 6 W/m², equivalently E = 1.585 √900 = 47.6 V/m. [japan-radio-law-table]
- **Quantity:** power density
- **Frequency band:** 300 MHz–1.5 GHz
- **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.
- **Frequency-dependent formula:** f/1500 mW/cm² (f in MHz), E = 1.585 √f V/m

## 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.
- [Macro cell tower (LTE / 5G sector antenna)](https://emfbase.com/emitters/cell-tower): Sector antennas radiate on the order of 1000 W EIRP per sector on the main beam, which is aimed above and away from the tower base — ground-level exposure directly beneath a tower is usually lower than at a few hundred metres away.

## 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.