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Worst 20% Hazes Across the Country. Based on IMPROVE Speciation Data by Marc Pitchford August 2001. What Causes Worst Day & When do the Occur. Southeastern US Sulfate dominates worst case days Most worst case days are in the late summer, rare to have any during cold periods

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worst 20 hazes across the country

Worst 20% Hazes Across the Country

Based on IMPROVE Speciation Data

by Marc Pitchford

August 2001

what causes worst day when do the occur
What Causes Worst Day & When do the Occur
  • Southeastern US
    • Sulfate dominates worst case days
    • Most worst case days are in the late summer, rare to have any during cold periods
  • Northeastern US
    • Sulfates dominate with occasional high nitrate
    • Many worst days are in the summer, but every season has some worst days
what causes worst day when do the occur1
What Causes Worst Day & When do the Occur
  • Northern Tier
    • Sulfates contribute any time of year
    • Nitrates contribute primarily in the Winter
    • Organics are occasionally important in the Summer
what causes worst day when do the occur2
What Causes Worst Day & When do the Occur
  • Interior Western US
    • Sulfates, Organics, & Coarse Mass share the blame on most worst case days
    • Apparent fire emissions (very high organic & elemental carbon) are sporadically responsible for unusually high haze levels
    • Apparent dust storms (very high coarse mass & fine soil) are occasionally responsible for unusually high haze levels
what causes worst day when do the occur3
What Causes Worst Day & When do the Occur
  • California
    • Nitrate, sulfate, & organic species contribute most on worst days
    • Worst days are distributed throughout the year
what causes worst day when do the occur4
What Causes Worst Day & When do the Occur
  • Alaska
    • Sulfate is important especially in the cold seasons (arctic haze from Eurasia?)
    • Organic is important especially in the warm seasons (apparently from forest fires)