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Emissions from an international airport increase particle number concentrations 4-fold at 10 km downwind.

Hudda N, Gould T, Hartin K, Larson TV, Fruin SA - Environ. Sci. Technol. (2014)

Bottom Line: The total freeway length in Los Angeles is 1500 km.These results suggest that airport emissions are a major source of PN in Los Angeles that are of the same general magnitude as the entire urban freeway network.They also indicate that the air quality impact areas of major airports may have been seriously underestimated.

View Article: PubMed Central - PubMed

Affiliation: Keck School of Medicine, Department of Preventive Medicine, University of Southern California , Los Angeles, California 90089, United States.

ABSTRACT
We measured the spatial pattern of particle number (PN) concentrations downwind from the Los Angeles International Airport (LAX) with an instrumented vehicle that enabled us to cover larger areas than allowed by traditional stationary measurements. LAX emissions adversely impacted air quality much farther than reported in previous airport studies. We measured at least a 2-fold increase in PN concentrations over unimpacted baseline PN concentrations during most hours of the day in an area of about 60 km(2) that extended to 16 km (10 miles) downwind and a 4- to 5-fold increase to 8-10 km (5-6 miles) downwind. Locations of maximum PN concentrations were aligned to eastern, downwind jet trajectories during prevailing westerly winds and to 8 km downwind concentrations exceeded 75 000 particles/cm(3), more than the average freeway PN concentration in Los Angeles. During infrequent northerly winds, the impact area remained large but shifted to south of the airport. The freeway length that would cause an impact equivalent to that measured in this study (i.e., PN concentration increases weighted by the area impacted) was estimated to be 280-790 km. The total freeway length in Los Angeles is 1500 km. These results suggest that airport emissions are a major source of PN in Los Angeles that are of the same general magnitude as the entire urban freeway network. They also indicate that the air quality impact areas of major airports may have been seriously underestimated.

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Los AngelesInternational Airport and 65 dB noise contours indicatingeastern jet trajectories.
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fig1: Los AngelesInternational Airport and 65 dB noise contours indicatingeastern jet trajectories.

Mentions: The airport complex is about 4.5 km east to west (E-W) andabout 2.5 km north to south (N–S) and is surrounded by majorroadways and freeways, as highlighted in Figure 1 (Figure S.1 in Supporting Information (SI) shows a map of this area with street name labels). The Federal AviationAdministration noise contours of the modeled annual 65 dB A-weightedequivalent (LAeq) noise threshold areshown11 extending eastward along the predominantdownwind direction and reflect the jet trajectories used for landing.They also extend west of the airport over the Pacific Ocean (not shown).


Emissions from an international airport increase particle number concentrations 4-fold at 10 km downwind.

Hudda N, Gould T, Hartin K, Larson TV, Fruin SA - Environ. Sci. Technol. (2014)

Los AngelesInternational Airport and 65 dB noise contours indicatingeastern jet trajectories.
© Copyright Policy - editor-choice
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4215878&req=5

fig1: Los AngelesInternational Airport and 65 dB noise contours indicatingeastern jet trajectories.
Mentions: The airport complex is about 4.5 km east to west (E-W) andabout 2.5 km north to south (N–S) and is surrounded by majorroadways and freeways, as highlighted in Figure 1 (Figure S.1 in Supporting Information (SI) shows a map of this area with street name labels). The Federal AviationAdministration noise contours of the modeled annual 65 dB A-weightedequivalent (LAeq) noise threshold areshown11 extending eastward along the predominantdownwind direction and reflect the jet trajectories used for landing.They also extend west of the airport over the Pacific Ocean (not shown).

Bottom Line: The total freeway length in Los Angeles is 1500 km.These results suggest that airport emissions are a major source of PN in Los Angeles that are of the same general magnitude as the entire urban freeway network.They also indicate that the air quality impact areas of major airports may have been seriously underestimated.

View Article: PubMed Central - PubMed

Affiliation: Keck School of Medicine, Department of Preventive Medicine, University of Southern California , Los Angeles, California 90089, United States.

ABSTRACT
We measured the spatial pattern of particle number (PN) concentrations downwind from the Los Angeles International Airport (LAX) with an instrumented vehicle that enabled us to cover larger areas than allowed by traditional stationary measurements. LAX emissions adversely impacted air quality much farther than reported in previous airport studies. We measured at least a 2-fold increase in PN concentrations over unimpacted baseline PN concentrations during most hours of the day in an area of about 60 km(2) that extended to 16 km (10 miles) downwind and a 4- to 5-fold increase to 8-10 km (5-6 miles) downwind. Locations of maximum PN concentrations were aligned to eastern, downwind jet trajectories during prevailing westerly winds and to 8 km downwind concentrations exceeded 75 000 particles/cm(3), more than the average freeway PN concentration in Los Angeles. During infrequent northerly winds, the impact area remained large but shifted to south of the airport. The freeway length that would cause an impact equivalent to that measured in this study (i.e., PN concentration increases weighted by the area impacted) was estimated to be 280-790 km. The total freeway length in Los Angeles is 1500 km. These results suggest that airport emissions are a major source of PN in Los Angeles that are of the same general magnitude as the entire urban freeway network. They also indicate that the air quality impact areas of major airports may have been seriously underestimated.

Show MeSH
Related in: MedlinePlus