Deutsch: Sekundäre NAAQS / Español: NAAQS secundarios / Português: NAAQS secundários / Français: NAAQS secondaires / Italiano: NAAQS secondari

Secondary National Ambient Air Quality Standards (NAAQS) in the environmental context refer to standards established by the United States Environmental Protection Agency (EPA) to protect the public welfare from any known or anticipated adverse effects of air pollutants. These standards are designed to safeguard not only human health but also the environment, including damage to animal species, crops, vegetation, buildings, and other aspects of the environment.

Description

The secondary NAAQS are aimed at addressing the broader environmental impacts of air pollution, which can include effects on lakes and streams, soils, materials, visibility, and the climate. These standards are part of the Clean Air Act's mandate to prevent air pollution that could negatively affect the environment and public welfare. They are set based on scientific evidence about the impacts of air pollution on the physical environment and are intended to be protective over long-term exposure.

Pollutants Regulated

The secondary standards apply to the same pollutants as the primary NAAQS, which include:

• Particulate matter (PM10 and PM2.5)
• Ozone (O3)
• Nitrogen dioxide (NO2)
• Sulfur dioxide (SO2)
• Carbon monoxide (CO)
• Lead (Pb)

Application Areas

The secondary NAAQS are critical for:

• Environmental protection: Protecting ecosystems and biodiversity from the harmful effects of air pollution.
• Agricultural productivity: Safeguarding crops and soil quality from air pollutants that can cause damage and reduce crop yields.
• Material conservation: Preventing the deterioration of buildings, monuments, and other structures caused by air pollution.
• Visibility protection: Addressing issues like smog and haze, especially in national parks and wilderness areas.

Well-Known Examples

A well-known application of the secondary NAAQS is the protection against visibility impairment in national parks and wilderness areas, often referred to as regional haze. Efforts under these standards have led to improvements in air quality that enhance the scenic views and natural beauty of these areas.

Treatment and Risks

Managing the factors that contribute to secondary air pollution involves regulatory controls, monitoring, and continuous scientific research to adapt standards based on new health and environmental data. Failure to meet these standards can lead to significant ecological and economic costs, including reduced biodiversity, damage to historical buildings, and losses in agricultural productivity.

Similar Terms

Related concepts include primary NAAQS, which are aimed specifically at protecting human health rather than public welfare and the environment. Both sets of standards are essential for providing a comprehensive approach to managing and improving air quality in the United States.

Summary

The Secondary National Ambient Air Quality Standards are a fundamental part of environmental regulation in the U.S., aimed at protecting the public welfare from the broader impacts of air pollution. These standards play a critical role in conserving natural environments, protecting material assets, and ensuring agricultural and ecological productivity in the face of air quality challenges.

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