Ozone O3

1.General characteristics

Highly oxidizing, very reactive gas with inecchatic odor. It focuses on the stratosphere and provides protection against life-threatening UV radiation. Ozone present at ground level acts as a component of "photochemical smog". It is formed by a reaction involving in particular nitrogen oxides and volatile organic compounds.

Effects on health
Soil ozone concentration causes respiratory tract irritation and eye irritation. High concentrations of ozone can cause reduced respiratory function.

Effects on the environment
It is responsible for damage to vegetation by atrophy of some tree species in urban areas.

2. Methods of measurement

The reference method for ozone measurement is that provided in SR EN 14625 standard Ambient air quality. Standardized method for measuring ozone concentration by ultraviolet photometry.

3. Norms

Law no. 104 of June 15, 2011
Ozone - O3
Alert threshold 240 g / m3 - average 1 hour
target values 120 g / m3 - the target value for the protection of human health (maximum daily averages for 8 hours)
18.000 g / m3 xh (AOT40) - target value for the protection of vegetation (averaging period: May to July)
The long term goal 120 ug / m3 - term objective to protect human health (maximum daily 8-hour mean a calendar year)
6000 ug / m3 xh (AOT40) - long-term target for vegetation protection (period of mediation: May - July)