NOx Levels Are Still a Problem in Europe and North America
Notes:
Trends in SO2 and NOx Emissions in North America and Europe (OECD Countries Only), 1980-94
In industrialized countries, environmental regulations restricting sulfur emissions and market forces that favor greater use of natural gas -- which contains little sulfur -- have proved relatively effective in cutting SO2 emissions. However, declines in SO2 emissions are likely to be partially offset in the future by emissions of NOx, which are now creeping up again,due mainly to increased vehicle numbers and usage. For more information see http://www.wri.org/trends/acidrain.html.
Source: Organization for Economic Co-Operation and Development (OECD), OECD Environmental Data Compendium 1997 (OECD, Paris, 1997); The Swedish Secretariat on Acid Rain, Acid News 5 (Int. Forsurnigssekretariatet, 1996), p. 14.
Note: Does not include Australia, Greece, Japan, Mexico, New Zealand, and Turkey due to incomplete data.