Megatrends Related to PM2.5 and Ozone

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Megatrends Related to PM2.5 and Ozone

• From SO2 and TSP to ozone and fine particulates.
• Recent health and environmental effects studies
  implicate ozone and fine particulates as two of
  the most serious current air quality problems in
  north America.
• From primary to secondary pollutants.
• Ozone as fine particles are not primary (emitted)
  but formed in the atmosphere from complex
  mixtures of precursor gases. There are no direct
  ways of identifying the impact of specific
  sources.
• From short range to long range impact.
• The atmospheric lifetime of O3 and PM2.5 is
  several days, so the winds carries them over
  1,000 km from their source. The result is
  "long-range transport" across state and
  international boundaries.
• From command and control to weight of evidence.
• The new AQ management style strives to include
  stakeholders in the policy development
  Encourages market-based resource allocations and
  applies 'weight of evidence' - to compliance
  management.