inversion

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Related to inversion layers: Temperature inversion, Thermal inversion
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Limitations of this analysis include the fact that risk estimates are based on PAH concentrations measured in winter, when the combination of inversion layers, higher emissions from combustion sources, and reduced atmospheric degradation all lead to higher concentrations than would likely be found in other months of the year.
AQMD officials blame the summer spike on a series of high pressure weather systems and atmospheric inversion layers that trapped pollutants close to the ground and allowed ozone levels to build up to unhealthy levels from one day to the next.