What is the 8 hour ozone standard?

What is the 8 hour ozone standard?

0.075 ppm
The 2008 ozone standard is set at a level of 0.075 ppm averaged over an 8-hour period. This standard is met at an air quality monitor when the 3-year average of the annual fourth-highest daily maximum 8-hour average ozone concentration is less than or equal to 0.075 ppm.

What is the NAAQS for ozone?

0.075 parts per million
The American Petroleum Institute (API) supports the option EPA included in the proposal to retain the current primary National Ambient Air Quality Standards (NAAQS) for ozone at the level of 0.075 parts per million (ppm).

What does NAAQS stand for?

The Clean Air Act requires EPA to set National Ambient Air Quality Standards (NAAQS) for pollutants that are common in outdoor air, considered harmful to public health and the environment, and that come from numerous and diverse sources.

What is an ozone exceedance?

An exceedance day occurs when the daily maximum 8-hour ozone average is 71 parts per billion (ppb) or higher. An exceedance day occurs when the daily maximum 8-hour ozone average is 71 parts per billion (ppb) or higher.

Does the EPA regulate ozone?

The Clean Air Act requires EPA to set national ambient air quality standards (NAAQS) for ozone and five other pollutants considered harmful to public health and the environment (the other pollutants are particulate matter, nitrogen oxides, carbon monoxide, sulfur dioxide and lead).

What is the federal Clean Air Act?

The Clean Air Act is the law that defines EPA’s responsibilities for protecting and improving the nation’s air quality and the stratospheric ozone layer. The last major change in the law, the Clean Air Act Amendments of 1990, was enacted by Congress in 1990.

What is NAAQS in air pollution management?

National Ambient Air Quality Standards (NAAQS), in the United States, allowable levels of harmful pollutants set by the Environmental Protection Agency (EPA) in accordance with the Clean Air Act (CAA). The CAA established two types of standards for ambient air quality.

When were NAAQS established?

1970
The 1970 CAA authorized the U.S. Environmental Protection Agency (EPA) to establish National Ambient Air Quality Standards (NAAQS) to protect public health and the environment.

How is ozone regulated?

The Clean Air Act regulates ozone as a criteria pollutant. The U.S. EPA sets National Ambient Air Quality Standards (NAAQS) for ozone, including both primary standards to protect public health and secondary standards to protect the environment.

What does NAAQS mean in air quality?

NAAQS Table. The Clean Air Act, which was last amended in 1990, requires EPA to set National Ambient Air Quality Standards (40 CFR part 50) for pollutants considered harmful to public health and the environment. The Clean Air Act identifies two types of national ambient air quality standards.

What are the primary and secondary standards of NAAQS?

NAAQS Table. Primary standards provide public health protection, including protecting the health of “sensitive” populations such as asthmatics, children, and the elderly. Secondary standards provide public welfare protection, including protection against decreased visibility and damage to animals, crops, vegetation, and buildings.

What happened to ozone NAAQS 2020?

On December 23, 2020, EPA completed its review of the full body of currently available scientific evidence and exposure/risk information and decided to retain the existing ozone NAAQS.