from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The amount by which something, especially a pollutant, exceeds a standard or permissible measurement.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An instance where an action, activity or substance exceeds a limit set by medical or legal practice.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (geology) the probability that an earthquake will generate a level of ground motion that exceeds a specified reference level during a given exposure time
Sorry, no etymologies found.
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:
Overall, the number of "exceedance days" is decreasing across the region, although the ozone standard is more difficult to meet.
The DEP issued a news release  assuring the public that the TDS was "not considered a major human health risk … But under the circumstances, if consumers have concerns, DEP recommends consumers use bottled water for drinking and preparing food until the exceedance is eliminated."
It would cause exceedance of my recommended daily allowance RDA of Guidos and that is not a good thing. juanito - John Davey says:
Other factors — for example, land-use change (i.e. unwise development), which can double the magnitude of the 1-percent-exceedance event (see Konrad) and greatly increase losses by placing more property at risk (see Pielke Jr.) — clearly matter, but is the prospect of AGW really that important with respect to inland riverine flooding?
Their foxtail series #3 — one of the key contributors to their exceedance statistics — is attributed to Lloyd and Graumlich 1997, who state, contrary to O&B, that:
O&B have selected the Yamal series, which has strong 20th century growth contributing markedly to their exceedance statistics.
The new standard also reduces "flip-flopping" in and out of attainment by changing it from an "expected exceedance" to a "concentration-based" form.