. Slash fire atmospheric pollution. Air Pollution; Slashburning Environmental aspects Northwest, Pacific. -40 -50 1400 -10 -20 -30 -40 -50 1500 -10 Time (hours and minutes) Figure 9.—Air temperatures monitored on the southeast corner of the broadcast fire on Pack Forest, June 25, 1968. EMISSION ANALYSIS Suspended particulate matter. — Gas chromatographic analysis of the benzene extracts from the high-volume filter mats showed up to 50 distinguishable peaks. Mass spectral data, obtained simultaneously, indicated the presence of alkanes, alkenes, alcohols, ketones, and essential
. Slash fire atmospheric pollution. Air Pollution; Slashburning Environmental aspects Northwest, Pacific. -40 -50 1400 -10 -20 -30 -40 -50 1500 -10 Time (hours and minutes) Figure 9.—Air temperatures monitored on the southeast corner of the broadcast fire on Pack Forest, June 25, 1968. EMISSION ANALYSIS Suspended particulate matter. — Gas chromatographic analysis of the benzene extracts from the high-volume filter mats showed up to 50 distinguishable peaks. Mass spectral data, obtained simultaneously, indicated the presence of alkanes, alkenes, alcohols, ketones, and essential oils. The particulate loading and extractable percent- age before and during the burning is shown in table 8. The background particulate loading was high for a rural area and probably due to slash burning on the previous day. The particulate loading increased the morning of June 25 prior to ignition. This may be due to increased vehicular traffic in the area by study personnel. At least two 18. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Fritschen, Leo. dn. Portland, Or. : Pacific Northwest Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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