QX/T 241-2014 in English
VALIDGrades of photochemical smog
- Issued on:2014-10-24
- Implemented on:2015-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
Introduction
Analysis of the core content of the standard
This standard defines a three-level classification system for photochemical smog. The core judgment indicators include:
| Key parameters | Threshold requirements | Monitoring methods |
|---|---|---|
| Ultraviolet index (UV) | ≥4 (hourly average) | GB/T 21005-2007 |
| Peroxyacetyl nitrate (PAN) | >5μg/m³ | Hourly average concentration |
| Ozone concentration (O₃) | Hourly/8-hour sliding mean | QX/T 71-2007 |
Key points for graded implementation
Typical application scenarios
The 2018 observation case in Pudong New Area, Shanghai shows that when the ozone analyzer measures the hourly concentration at 312μg/m³ and the UV index is 6, the system automatically triggers a moderate pollution warning and the education department immediately calls a halt to outdoor sports activities in primary and secondary schools.
Level Comparison Analysis
| Level | Hourly Ozone Concentration (μg/m³) | Health Intervention Measures |
|---|---|---|
| Mild | 200-300 | Sensitive groups should reduce prolonged outdoor activities |
| Moderate | 300-400 | It is recommended to wear KN95 masks |
| Severe | >400 | Close outdoor places in schools |
Background of Technological Evolution
This standard refers to the WHO 1987 European Air Quality Guidelines and combines the pollution characteristics of my country's urban agglomerations:
- 1990s: Only primary pollutants were monitored
- 2000s: The concept of secondary pollutants was introduced
- 2010s: A composite determination system for photochemical smog was established
Implementation Suggestions
- Establish a collaborative observation network of ultraviolet radiometers and ozone lidar
- Develop a hierarchical visual early warning platform based on GIS
- Improve the correlation analysis mechanism for the outpatient volume of respiratory departments in medical institutions
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