GB/T 20480-2025 English PDFUS$219.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 20480-2025: Classification of sand and dust weather Status: Valid GB/T 20480: Historical versions
Basic dataStandard ID: GB/T 20480-2025 (GB/T20480-2025)Description (Translated English): Classification of sand and dust weather Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: A47 Classification of International Standard: 07.060 Word Count Estimation: 10,163 Date of Issue: 2025-05-30 Date of Implementation: 2025-12-01 Older Standard (superseded by this standard): GB/T 20480-2017 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 20480-2025: Classification of sand and dust weather---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.ICS 07.060 CCSA47 National Standard of the People's Republic of China Replace GB/T 20480-2017 Dust weather level Released on 2025-05-30 2025-12-01 Implementation State Administration for Market Regulation The National Standardization Administration issued Table of contentsPreface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Single-area sandstorm weather level 1 4.1 Classification basis and levels 1 4.2 Division indicators 1 5 Sand and dust weather process level 2 5.1 Classification basis and levels 2 5.2 Classification Index 2 Reference 3ForewordThis 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. This document replaces GB/T 20480-2017 "Sand and Dust Weather Grades". Compared with GB/T 20480-2017, except for structural adjustments and editing In addition to the changes in performance, the main technical changes are as follows. a) Change the terms “weather process” and “visibility” to “dust weather process” and “horizontal visibility” (see 3.2 and 3.3,.2017 edition). 2.2, 2.3), the terms “National Basic Meteorological Station” and “National Reference Climate Station” were deleted (see 2.5 and 2.6 of the.2017 edition); b) The "single-station dust level" was changed to "single-location dust weather level", and the horizontal visibility index requirements in the level classification were changed (see Chapter 4, Chapter 3 in the.2017 edition). c) Change “Regional dust weather level” to “Dust weather process level” (see Chapter 5, Chapter 4 of the.2017 edition), change The classification basis and levels were revised (see 5.1, 4.1 of the.2017 edition); "regional dust weather" was deleted (see 4.2.1 of the.2017 edition). 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 China Meteorological Disaster Prevention and Mitigation Standardization Technical Committee (SAC/TC345). This document was drafted by. National Meteorological Center, National Climate Center, Forestry and Grassland Survey and Planning Institute of the State Forestry and Grassland Administration, China Meteorological Administration, National Forestry and Grassland Administration (National Park Administration). The main drafters of this document are. An Linchang, Yang Mingzhu, Sun Tao, Wang Bang, Wen Ping, Liu Xusheng, Gui Hailin, Wang Jikang and Zhang Bihui. The previous versions of this document and the documents it replaces are as follows. ---First published in.2006 as GB/T 20480-2006, first revised in.2017; ---This is the second revision. Dust weather level1 ScopeThis document stipulates the sandstorm weather levels at single locations and the sandstorm weather process levels. This document is applicable to the monitoring, forecasting, warning, assessment, services and scientific research of sandstorm weather.2 Normative referencesThis document has no normative references.3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 sand and dust weather A weather phenomenon in which sand and dust are suspended in the air, reducing atmospheric visibility. 3.2 The entire process of the emergence, evolution and disappearance of sandstorm weather is affected by the same weather system. 3.3 Horizontal visibility A person with normal vision can see and identify a near-ground target (black, of appropriate size) against the sky background under the prevailing weather conditions. At night, it refers to the maximum horizontal distance at which a light source of medium 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 33673-2017, 2.1] 3.4 Wind force The intensity of wind is often expressed in wind scale in meteorology, and the Beaufort scale is often used internationally. [Source. GB/T 28591-2012, 2.2] 4 Single-location sandstorm weather level 4.1 Classification basis and levels The level of sandstorm weather in a single area is mainly divided according to the horizontal visibility when the sandstorm weather occurs, and the wind speed is also taken into consideration. Single-location sandstorm weather with visibility less than 10km is divided into five levels. floating dust, blowing sand, sandstorm, strong sandstorm, and extremely strong sandstorm. 4.2 Division indicators 4.2.1 Dust There is no wind or the wind force is less than or equal to level 3.Sand and dust on the ground are suspended in the air, making the air turbid. 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