Chlorofluorocarbon Levels Start to Decline Following Montreal Protocol

Average annual chlorofluorocarbons (CFCs) levels in the northern and southern hemispheres measured in parts per trillion (ppt)

This chart shows the average annual chlorofluorocarbon (CFC) levels in the Northern and Southern Hemispheres, measured in parts per trillion (ppt). It highlights that CFC levels started to decline following the implementation of the Montreal Protocol. This data helps illustrate the effectiveness of international agreements in reducing harmful emissions.

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CFCs are man-made chemicals that were once commonly used in air conditioners, refrigerators, and aerosol sprays, and damage the Earth's ozone layer.

Source: NOAA Atmospheric Histories. Get the data