QX/T 240-2014 in English

VALID

Identification of photochemical smog

Issued on:2014-10-24
Implemented on:2015-03-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $230.00
$224.00

Standard No:	QX/T 240-2014
Document status:	VALID
Title in English:	Identification of photochemical smog
Title in Chinese:	光化学烟雾判识
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2014-10-24
Implemented on:	2015-03-01
ICS Classification:	07.060-Geology. Meteorology. Hydrology
Chinese Classification:	A47-Meteorology
Professional Classification:	QX-Meteorology
Related Topics:	Effect of smoke box Photoelectrochemistry smoke Effect of smoke box Photoelectrochemistry Photochemistry Spectrophotometer judgment Photochemical smog atomization and atomization hj/t 240 Photochemical technetium Atomizer Atomizer Atomizer Nebulizer fluorescent smoke tracer Optical Physics and Chemistry How to judge chemistry Photochemical smog chamber Chemistry Knowledge Photochemistry smoke spectrum chemical smog QX chemical smog light smoke method mt/t 240 mist light sentence smoke dataset atomization a photochemical smog Spectrum determination Measurement of Optical Haze "Photochemistry mist and light mist light terahertz chemical smog Chemistry knowledge about zongzi Atomization industry

Introduction

Standard Background and Scope of Application

This standard is formulated to address the increasingly prominent photochemical smog pollution problem in the process of urbanization, and specifies a technical framework for identification based on the ultraviolet index and ozone concentration. It is applicable to the monitoring and early warning services of meteorological and environmental protection departments.

Analysis of core identification conditions

Indicator	Threshold condition	Measurement specification
Ultraviolet index (CUVI)	≥Level 4	Calculated according to GB/T 21005-2007
Peroxyacetyl nitrate (PAN)	＞5μg/m³	Hourly average
Hourly ozone concentration (O₃)	≥200μg/m³	Single hourly average
8-hour ozone concentration	≥160μg/m³	Sliding 8-hour mean

Technology evolution analysis

Compared with the WHO 1987 guidelines, this standard innovatively introduces PAN concentration as an auxiliary criterion to reflect the complex pollution characteristics of my country. Compared with HJ 633-2012, the precondition of ultraviolet radiation intensity is added.

Typical application case

The monitoring data of the Pearl River Delta in 2016 showed that when the UV index reached level 5 and the PAN concentration rose to 7.2μg/m³, although the hourly ozone concentration was only 192μg/m³, the 8-hour concentration had reached 168μg/m³, which still triggered the photochemical smog warning.

Implementation Suggestions

Monitoring Equipment Configuration: UV radiometer, ozone analyzer and PAN online monitor need to be deployed simultaneously
Data Quality Control: Ozone monitoring should comply with QX/T 171-2007 specification
Early Warning Response Mechanism: It is recommended to establish a graded response system and initiate emergency measures when PAN＞8μg/m³

Comparison of International Standards

Standard System	Ozone Threshold (μg/m³)	Auxiliary Indicators	Scope of Application
QX/T 240-2014	200(1h)/160(8h)	UV+PAN	Weather Warning
WHO European Guidelines	180(1h)/100(8h)	NO₂+VOCs	Health Assessment
EPA Standards	235(1h)/140(8h)	PM₂.5	Environmental Supervision

More samples: DL/T 5154-2012 JC/T 2453-2018 GB 50021-2001(2009)

Sample only — not a preview of QX/T 240-2014

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