• ozone
  • Mesocosms taken from a lowland raised bog in northern England were exposed in open-top chambers for 2 years to ambient air or ambient air plus ozone elevated for 8 h day −1 by an average of 49 ppb in summer and 10 ppb in winter. (wiley.com)
  • AMHERST, Mass. - A new study assessing the influence of species diversity of canopy trees on the amount of ozone precursors a forest emits suggests that atmospheric chemistry models in use now may underestimate the importance of tree species mix and size to ozone pollution, says lead author Alexander Bryan, a postdoctoral fellow in the Northeast Climate Science Center at the University of Massachusetts Amherst. (umass.edu)
  • As Bryan explains, "Ozone pollution models do really well at predicting air quality in urban areas because that's where the problem started. (umass.edu)
  • fully
  • Additional legislation was passed in 1963 to better fully define air quality criteria and give more power in defining what air quality was to the secretary of Health, Education, and Labor. (wikipedia.org)
  • This amendment was not as effective as it was initially thought to be, with only 36 air regions designated, and as well as no states having fully developed pollution control programs. (wikipedia.org)
  • years
  • A mere two years later, the Federal Air Quality Act was established to define "air quality control regions" scientifically based on topographical and meteorological facets of air pollution. (wikipedia.org)