GB/T 45425-2025 English PDF

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GB/T 45425-2025: Fog warning levels
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 45425-2025	129	Add to Cart	3 days	Fog warning levels	Valid

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Basic data

Standard ID: GB/T 45425-2025 (GB/T45425-2025)
Description (Translated English): Fog warning levels
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A47
Classification of International Standard: 07.060
Word Count Estimation: 6,652
Date of Issue: 2025-02-28
Date of Implementation: 2025-06-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 45425-2025: Fog warning levels

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
GB/T 45425-2025 English version. Fog warning levels ICS 07.060 CCSA47 National Standard of the People's Republic of China Fog warning level Released on 2025-02-28 2025-06-01 Implementation State Administration for Market Regulation The National Standardization Administration issued

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Meteorological Administration. This document is under the jurisdiction of the National Technical Committee for Standardization of Meteorological Disaster Prevention and Mitigation (SAC/TC345). This document was drafted by. National Meteorological Center, Chinese People's Liberation Army Chemical Defense College. The main drafters of this document. Zhang Bihui, Wang Fan, Li Ming, Tian Wei, and Yang Weidi. Fog warning level

1 Scope

This document specifies the classification and issuance rules for fog warning levels. This document is applicable to land fog warning services and is used as a reference for related services.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 27964-2011 Fog forecast level

3 Terms and definitions

The following terms and definitions apply to this document. 3.1 fog A visible aggregate of large numbers of fine milky white water droplets or ice crystals suspended in the near-ground atmosphere. [Source. GB/T 27964-2011, 2.1] 3.2 Visibility For people with normal vision, under the prevailing weather conditions, daytime refers to near-ground targets (black, At night, it refers to the maximum horizontal distance at which a light object of moderate intensity can be seen and identified. Note. The minimum brightness contrast (contrast threshold) that a person with normal vision can perceive is 0.05. [Source. GB/T 27964-2011, 2.2, modified] 3.3 National Basic Weather Station A ground meteorological observation station set up according to the needs of national climate analysis and weather forecast. [Source. QX/T 685-2023, 3.1] 3.4 National Reference Climatological Station According to the national climate division and the requirements of the global climate observation system, the Ground meteorological observation stations. [Source. GB 31221-2014, 2.3]

4 Classification

4.1 The fog warning level is divided according to visibility and is determined according to the visibility threshold specified in Table 1 of GB/T 27964-2011. ......

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