Measured and predicted airshed concentrations of methyl bromide in an agricultural valley and applications to exposure assessment

Honaganahalli, Puttanna S.; Seiber, James N.

doi:10.1016/s1352-2310(00)00138-2

Cited by 19 publications

(19 citation statements)

References 14 publications

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“…We selected a 5-km buffer distance for this analysis because it best captures the spatial scale most strongly correlated with measured ambient methyl bromide concentrations (Honaganahalli and Seiber 2000; Li et al 2005; Ross et al 1996). In particular, Li et al (2005) investigated the empirical relationship between methyl bromide use and ambient air concentrations in the same agricultural region (Salinas Valley) and time period of interest (2000) as our study using a variety of spatiotemporal scales.…”

Section: Methodsmentioning

confidence: 99%

“…It is estimated that 30–50% of agricultural applications of methyl bromide are released into the air even when protective measures such as plastic tarps are in place (Honaganahalli and Seiber 2000; Majewski et al 1995; Yagi et al 1993). Because inhalation is the primary route of exposure to methyl bromide, ambient air concentrations are important for assessing exposure to nearby residents (National Research Council 2000).…”

mentioning

confidence: 99%

“…In agricultural areas of California, measured outdoor concentrations of methyl bromide averaged 0.1–7.7 ppb over an 8-week monitoring period in 2000 (California Air Resources Board 2001), or up to one-tenth of the levels associated with adverse outcomes in some animal studies (Breslin et al 1990; Sikov et al 1981). In addition, methyl bromide has been detected in air > 70 km away from the nearest application site (Honaganahalli and Seiber 2000). …”

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confidence: 99%

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Residential Proximity to Methyl Bromide Use and Birth Outcomes in an Agricultural Population in California

Gemmill

Gunier

Bradman

et al. 2013

Environ Health Perspect

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Background: Methyl bromide, a fungicide often used in strawberry cultivation, is of concern for residents who live near agricultural applications because of its toxicity and potential for drift. Little is known about the effects of methyl bromide exposure during pregnancy.Objective: We investigated the relationship between residential proximity to methyl bromide use and birth outcomes.Methods: Participants were from the CHAMACOS (Center for the Health Assessment of Mothers and Children of Salinas) study (n = 442), a longitudinal cohort study examining the health effects of environmental exposures on pregnant women and their children in an agricultural community in northern California. Using data from the California Pesticide Use Reporting system, we employed a geographic information system to estimate the amount of methyl bromide applied within 5 km of a woman’s residence during pregnancy. Multiple linear regression models were used to estimate associations between trimester-specific proximity to use and birth weight, length, head circumference, and gestational age.Results: High methyl bromide use (vs. no use) within 5 km of the home during the second trimester was negatively associated with birth weight (β = –113.1 g; CI: –218.1, –8.1), birth length (β = –0.85 cm; CI: –1.44, –0.27), and head circumference (β = –0.33 cm; CI: –0.67, 0.01). These outcomes were also associated with moderate methyl bromide use during the second trimester. Negative associations with fetal growth parameters were stronger when larger (5 km and 8 km) versus smaller (1 km and 3 km) buffer zones were used to estimate exposure.Conclusions: Residential proximity to methyl bromide use during the second trimester was associated with markers of restricted fetal growth in our study.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Residential Proximity to Methyl Bromide Use and Birth Outcomes in an Agricultural Population in California

Gemmill

Gunier

Bradman

et al. 2013

Environ Health Perspect

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“…This approach is not well suited for complex terrains due to non-homogeneity of wind areas, uncertainties contained within altitude values, coastal evaporation, and geographical effects [43]. In addition, turbulence predictions made by the CALMET meteorological model are limited in complex terrains at high altitudes due to the nature of the model [44]. When the study area is evaluated in respect to this, the district has a substantially complex terrain from a topographical point of view.…”

Section: Evaluation Of Model Performancesmentioning

confidence: 99%

Determining Performance and Application of Steady-State Models and Lagrangian Puff Model for Environmental Assessment of CO and NOx Emissions

Demirarslan¹,

Doğruparmak²

2016

Pol. J. Environ. Stud.

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Air quality modellings are highly useful systems used to investigate the possible impact of emissions diffusing into the atmosphere in any area they might have on that area. There are many modelling methods whose capacities are limited by their advantages and disadvantages or the equipment they use. In this study, therefore, both steady-state models (AERMOD and ISCST-3) and the Lagrangian model (CALPUFF) are used. This study has two purposes: one is to specify performance of the models. Performances were determined with various statistical methods such as fractional bias (FB), mean squared error (MSE), and geometric mean bias (MG). The other purpose of this study is to evaluate temporal and spatial variations of point (P), area (A), and line (L) -sourced CO and NO x emissions in the research area by using the modelling methods. The district of Körfez, which is one of the districts of the province of Kocaeli, was chosen as the study area.When the results obtained with modelling all P and A sources by three programs are analyzed, the highest annual concentration AERMOD, ISCST-3, and CALPUFF were found as 128.82, 86.96, and 201.30 µg/m 3 for CO, and 7.56, 26.31, and 6.10 µg/m 3 for NO x , respectively. On the other hand, when the results obtained with modelling all P and A and L sources by two programs are investigated, the highest annual concentration AERMOD and ISCST-3 were found to be 155.12, 92.46 µg/m 3 for CO, and 166.93 and 89.98 µg/m 3 for NO x , respectively. When contributions of the pollutant sources on pollution are evaluated, it was observed that area sources and line sources are more predominant than other sources for CO and NO x emissions. It was observed by analyzing the diffusion maps that residential areas in the district are more concentrated. Therefore, in the study the predicted and observed values were also compared with national and international limit values and determined to meet these limit values. According to the results obtained by evaluation of performances of the models with FB, MS, and MG statistical methods, performance sorting for NO x emissions was found to be ISCST-3 > CALPUFF > AERMOD, while for CO emissions it is given as

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“…Honaganahalli and Seiber [3] have compared Industrial Source Complex Short Term 3 (ISCST3 -a plume dispersion model) with CALPUFF (a puff dispersion model) for several fumigated fields serving as source for methyl bromide (CH 3 Br) in the Salinas Valley-California. The simulated results were compared with the field measurement from 11 sites on the adjacent mountains, valley floor and at Pacific Ocean coast over a 4 days period.…”

Section: Introductionmentioning

confidence: 99%

Total SO2 Emissions from Power Stations and Evaluation of their Impact in Kuwait Using a Gaussian Plume Dispersion Model

Ramadan¹,

Al-Sudairawi²,

Alhajraf³

et al. 2008

American J. of Environmental Sciences

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Abstract:In Kuwait, most of the power stations use fuel oil as the prime source of energy. The sulphur content (S%) of the fuel used as well as other factors have a direct impact on the ground level concentration of sulphur dioxide (SO 2 ) released by power stations into the atmosphere. The SO 2 ground level concentration has to meet the environmental standards set by Kuwait Environment Public Authority (KEPA). In this communication we present results obtained using the Industrial Sources Complex Short Term (ISCST3) model to calculate the SO 2 concentration resulting from existing power stations in Kuwait assuming zero background SO 2 concentration and entire reliance on Heavy Fuel Oil. 1, 2, 3 and 4S% scenarios were simulated for three emission cycle cases. The computed annual SO 2 concentrations were always less than KEPA standards for all scenarios. The daily SO 2 concentrations were within KEPA standards for 1S% but violated KEPA standards for higher S%. In general, the concentrations obtained from the combined hourly and seasonal cycle were the lowest and those obtained from the no cycle case were the highest. The comparison between the results of the three cycles revealed that the violation times cannot be solely attributed to the increase in emissions and the meteorological conditions have to be taken into consideration.

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Measured and predicted airshed concentrations of methyl bromide in an agricultural valley and applications to exposure assessment

Cited by 19 publications

References 14 publications

Residential Proximity to Methyl Bromide Use and Birth Outcomes in an Agricultural Population in California

Residential Proximity to Methyl Bromide Use and Birth Outcomes in an Agricultural Population in California

Determining Performance and Application of Steady-State Models and Lagrangian Puff Model for Environmental Assessment of CO and NOx Emissions

Total SO2 Emissions from Power Stations and Evaluation of their Impact in Kuwait Using a Gaussian Plume Dispersion Model

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