QX/T 513-2019 in English

Analysis of the core content of the standard

This standard innovatively establishes a quantitative classification system for haze weather processes based on the network data of the National Meteorological Observation Station, and realizes scientific classification through three dimensions: visibility threshold (10km/3km/2km), duration (3 days/2 days) and spatial coverage (1/2 or 1/3 stations).

Comparison of grading standards

Key technical points

Recommendations for the implementation of the standard

1. Data quality control: It is recommended to establish a regular calibration system for visibility sensors, referring to GB/T 31159-2014
2. Cross-regional collaboration: A provincial data sharing mechanism needs to be initiated for national processes, and it is recommended to develop an automated identification system
3. Historical data backtracking: This standard can be used to re-classify and evaluate the heavy haze events from 2013 to 2018

Technology evolution analysis

Compared with the 2003 version of the "Ground Meteorological Observation Specification", this standard introduces for the first time:

• Quantitative spatial coverage index (1/2 or 1/3 stations)
• Distinguish between regional and national processes
• Establish a three-level classification system (mild/moderate/severe)