Definition of "exceedance" [exceedance]

• The amount by which something, especially a pollutant, exceeds a standard or permissible measurement. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Smog "exceedance" - the amount by which ozone levels top the California standard of 90 parts per billion-would drop 12 percent."
• "As far as I'm concerned, the predictions of temperature increases are non-controversial, so I won't discuss them other than to note that the pix in their article are not temperature increases, but increases in exceedance, which is why the tropics looks more affected by the mid-latitudes."
• "If a municipal water plant is found to have an exceedance they must:"