Abstract
Evidence is presented that open burning of twigs, branches, leaves, orchard prunings and other domestic yard debris may contribute as much to the daily fine particle pollution during the spring as woodburning does in the winter. The feasibility of using a gaseous tracer model is demonstrated to estimate the contribution of backyard burning to air pollution in the Portland, Oregon area. Measurements of the tracer, methyl chloride, were taken at rural and suburban sites throughout the year. The 39 days isolated as woodburning days show a contribution of 52 + or - 10 ..mu..g/m/sup 3/ to the fine aerosol concentration on winter evenings, and the 7 days isolated as entirely backyard burning days show a contribution of 61 + or - 6 ..mu..g/m/sup 3/ to the fine aerosol on spring and fall evenings. The maximum contribution from woodburning during the winter of 1981-1983 was 166 ..mu..g/m/sup 3/; 18% of the evenings when there was woodburning showed a contribution of greater than 100 ..mu..g/m/sup 3/ during the evening hours. The maximum concentration during evenings with backyard burning was 92 ..mu..g/m/sup 3/.
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