Impact of the 2002 Canadian Forest Fires on Particulate Matter Air Quality in Baltimore City
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Citations
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References
Lung Cancer, Cardiopulmonary Mortality, and Long-term Exposure to Fine Particulate Air Pollution
Aerosol Technology : Properties, Behavior, and Measurement of Airborne Particles
The National Human Activity Pattern Survey (NHAPS): a resource for assessing exposure to environmental pollutants.
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Mechanisms in the cycle of violence
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Frequently Asked Questions (12)
Q2. What is the effect of the transport of air pollutants in the free troposphere?
Transport of air pollutants in the free troposphere is more efficient than in the mixed layer because of fewer loss mechanisms and stronger winds (4).
Q3. What is the effect of the strong vertical mixing in the daytime mixed layer?
The strong vertical mixing in the daytime mixed layer (ML) and the weak mixing above the temperature inversion on top of the ML lead to an accumulation of aerosol, heat, and moisture within the ML and a strong drop in these quantities in the free troposphere.
Q4. What are the factors that need to be evaluated for the potential to reduce exposures during such episodes?
In addition to staying indoors, factors such as closing windows, running air conditioners in recirculation mode, using air purifiers, and encouraging the use of adequately ventilated community centers need to be appropriately evaluated for the potential to reduce exposures during such episodes.
Q5. What was the peak of the PM10 concentration in Kuala Lumpur?
During the peak of these events, a PM10 concentration in excess of 400 µg/m3 was observed in Kuala Lumpur, Malaysia (14), Singapore (13), and Darussalam, Brunei (15).
Q6. What was the entrainment of the smoke plume into the mixed layer?
The entrainment of the smoke plume into the mixed layer evident from the LIDAR measurements coincided with a dramatic increase in ground-level PM concentrations at both ambient monitoring sites (sites A1 and A2), clearly defining the forest fire pollution episode.
Q7. What was the result of the transport and monitoring of PM in Baltimore?
The transport and monitoring results consistently identified a forest fire related PM episode in Baltimore that occurred the first weekend of July 2002 and resulted in as much as a 30-fold increase in ambient fine PM.
Q8. Why is PM preferentially transported over long distances?
The fine fraction PM is preferentially transported over long distances because these particles are too small to settle by gravity and too large to coagulate (38).
Q9. What was the average indoor-outdoor ratio during the episode?
The median indoor-to-outdoor ratio during the episode was 0.91 (quartiles of 0.74 and 1.05), indicating efficient particle penetration.
Q10. How did the smoke cloud in the mixed layer appear?
The LIDAR verifies that the smoke cloud shown by MODIS images (recorded at 1035 EDT) existed at heights between 1100 and 1800 m above ground level before entrainment into the mixed layer.
Q11. What is the significance of long-range transport of pollutants?
The phenomenon of long-range transport of pollutants is of significant concern both for regulatory compliance and for public health.
Q12. What was the average PM concentration at the three sites?
The maximum PM concentrations measured at sites A1 (PM2.5 TEOM), A3 (PM10 MIE), and I-1-I-4 (PM10 MIE) were 199, 645, and 590 µg/m3, respectively.