The hybrid buses did, however, produce more nitrogen oxide, which contributes to ground-level ozone.
Methane, which is released from farms, landfills, coal mines and petroleum operations, contributes to ground-level ozone associated with smog and poorer yields from crops.
Ozone produced in East Asia can travel all the way to the western United States, where it directly contributes to ground-level concentrations of the pollutant, according to a new study in the Journal of Geophysical Research.
Many U.S. cities have nonattainment zones for NOx, which contributes to ground-level ozone and can damage lung tissue and vegetation.
Therefore, when we applied the slip model directly to the stochastic finite-fault approach, we found that asperity II contributed to ground motion for about 6 s.
Phases out use of MTBE's, a group of gasoline additives that reduce air pollution but have been found to contribute to ground-water contamination.
In general, the fresher the asphalt, the more fumes it emits, according to the Environmental Protection Agency, and under some circumstances asphalt does contribute to ground-level ozone, commonly referred to as smog.
But in day-to-day driving, the vehicle emits nitrogen oxide well over the allowed amount, contributing to ground-level ozone and fine particulate matter emissions and worsening pollution.
Some local landfill sites may have also contributed to ground-water contamination.
Both NOX and VOCs contribute to ground-level ozone, an air pollutant with significant respiratory and cardiac health effects.
SO2 and NOX contribute to ground-level ozone and fine particle pollution and often cross state lines, ending up far from their provenance.
