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Peroxyacetyl nitrate in eastern Scotland.

G G McFadyen1, J N Cape

  • 1Centre for Ecology and Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK.

The Science of the Total Environment
|January 1, 2005
PubMed
Summary

Peroxyacetyl nitrate (PAN) pollution was monitored in Scotland from 1994-1998. High PAN levels, up to 3 nl l(-1), were linked to long-range transported air masses.

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Area of Science:

  • Atmospheric Chemistry
  • Environmental Science
  • Air Quality Monitoring

Background:

  • Peroxyacetyl nitrate (PAN) is a key atmospheric pollutant.
  • Understanding PAN dynamics is crucial for air quality management and photochemical smog assessment.

Purpose of the Study:

  • To investigate the temporal and spatial characteristics of PAN concentrations.
  • To analyze the relationship between PAN, ozone, and NOx.
  • To identify sources and transport patterns of PAN pollution.

Main Methods:

  • Hourly air sampling for PAN concentrations over a four-year period (1994-1998).
  • Statistical analysis of concentration data, including distribution and diurnal/seasonal cycles.
  • Correlation analysis with ozone and NOx levels.
  • Case studies of high concentration episodes and source attribution.

Main Results:

  • Annual average PAN concentrations ranged from 0.1 to 0.15 nl l(-1), with episodic peaks up to 3 nl l(-1).
  • PAN concentrations exhibited a log-normal distribution with a seasonal maximum in late spring.
  • Poor correlation with ozone, except during pollution episodes (PAN/O3 > 0.01).
  • PAN/NOx ratios varied significantly, with a median of 0.015.

Conclusions:

  • PAN levels at the rural Scottish site were influenced by long-range transport of polluted air masses.
  • The study highlights the complex interplay of photochemical production, decomposition, and deposition in regulating PAN concentrations.
  • Episodic high PAN concentrations, traceable over 1000 km, underscore the transboundary nature of air pollution.

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