Earlier this month, the US EPA released their proposal for Implementing the 2008 National Ambient Air Quality Standards for Ozone. This includes their suggested Nonattainment Area Classifications Approach and Attainment Deadlines.
The full proposal can be read here. This table from this proposal summarizes the ranges used to classify attainment based on the 2008 standard as well as the length of time to reach compliance.
Below is a summary of an earlier post regarding ozone generation and its uses, including calibration of ambient air monitoring systems.
Ozone used in industry, depending on the conditions (especially temperature and humidity) and method of generation, can be formed at concentrations ranging from 1 – 30%. It can be used to disinfect water, clean air and laundry or kill insects in grain. Ozone is also used in processing of manufacturing and production.
There are a variety of ways ozone is generated, but the two main methods of are corona discharge and UV light (Read the details about ozone generation).
In brief, the corona discharge method is the most common type of ozone generator for personal uses. The are used in ambient conditions and are more susceptible to environmental conditions.
UV ozone generators employ a light source that generates a narrow-band ultraviolet light, mimicking the production of ozone in the atmosphere. When used in calibration systems, such as those manufactured by Environics, there are a variety of industry standards that must be met to guarantee accuracy and reliability of the ozone produced (EPA criteria for ozone transfer standard).
Learn about our Ambient Monitor Gas Calibrators with Ozone Generators or contact us for more details.