The Vienna Convention on the Protection of the Ozone Layer is an international agreement that aims to protect the ozone layer by controlling emissions of ozone-depleting substances.

The Montreal Protocol is an international agreement that aims to protect the ozone layer by controlling emissions of ozone-depleting substances.

The United Nations Environment Programme (UNEP) is the leading global environmental authority that sets the global environmental agenda, promotes the coherent implementation of the environmental dimension of sustainable development within the United Nations system, and serves as an authoritative advocate for the global environment.

The Clean Air Act is a United States federal law that regulates air emissions from stationary and mobile sources.

The Kyoto Protocol is an international agreement that aims to reduce emissions of greenhouse gases.

The Paris Agreement is an international agreement that aims to limit global warming to 2 degrees Celsius.

The World Meteorological Organization (WMO) is a specialized agency of the United Nations that is responsible for coordinating global efforts to monitor and predict the weather, climate, and water resources.

The Clean Air Act Amendments of 1990 were designed to reduce acid rain and improve air quality.

The Stockholm Convention is an international agreement that aims to reduce emissions of persistent organic pollutants (POPs).

The Gothenburg Protocol is an international agreement that aims to reduce air pollution.

The United Nations Environment Programme (UNEP) is the leading global environmental authority that sets the global environmental agenda, promotes the coherent implementation of the environmental dimension of sustainable development within the United Nations system, and serves as an authoritative advocate for the global environment.

The Clean Air Act Amendments of 1970 were designed to reduce air pollution and improve air quality.

The Minamata Convention is an international agreement that aims to reduce emissions of heavy metals.

The Clean Air Interstate Rule (CAIR) is a United States federal regulation that aims to reduce air pollution.

The United Nations Framework Convention on Climate Change (UNFCCC) is the leading international environmental treaty that sets the global framework for addressing climate change.