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Empirical Relationship between Use, Area, and Ambient Air Concentration of Methyl Bromide

California Environmental Protection Agency, Department of Pesticide Regulation, Environmental Monitoring Branch, Post Office Box 4015, Sacramento, CA 95812-4015

View larger version (68K): [in a new window]   Fig. 1. Location of monitoring sites in Kern County in 2000, and distribution of methyl bromide (MeBr) use during the air-monitoring period (16 July–31 Aug. 2000). Each cell on the use map represents a section, approximately 1.609 x 1.609 km (or 1 x 1 mi).

View larger version (65K): [in a new window]   Fig. 2. Location of monitoring sites in Monterey and Santa Cruz Counties in 2000, and distribution of methyl bromide (MeBr) use during the air-monitoring period (8 Sept.–2 Nov. 2000). Each cell on the use map represents a section, approximately 1.609 x 1.609 km (or 1 x 1 mi).

View larger version (67K): [in a new window]   Fig. 3. Section, township, and use area in relation to the monitoring site. A section is approximately 1.609 x 1.609 km (or 1 x 1 mi), which is numbered 1 through 36. A township consists of 36 sections, and is approximately 9.654 x 9.654 km (or 6 x 6 mi). The 5 x 5 and 7 x 7 use areas contain 25 and 49 sections, respectively, around the monitoring site.

View larger version (43K): [in a new window]   Fig. 4. Regression models between average of weekly average air concentration and average of weekly methyl bromide (MeBr) use over various areas. Averages of air concentration and use were taken over the 7- to 8-wk period.

View larger version (15K): [in a new window]   Fig. 5. Predicted vs. measured average air concentrations over the monitoring period of 2000 and 2001. The model use for prediction was calibrated using the 2000 air-monitoring data and use data.