Technical Abstract: Emission monitoring is necessary to evaluate the impact of air pollutants such as soil fumigants on the environment. Quantifying fumigant emissions often involves the use of air sampling tubes filled with sorbents to trap fumigants. 1,3-dichloropropene (1,3-D) and chloropicrin (CP) are being increasingly used in combination in soil fumigation since the phase-out of methyl bromide. Charcoal and XAD-4 resins are used for trapping 1,3-D, and CP, respectively. If one sampling tube can trap both chemicals, the number of samples, the amount of work, and associated costs can be significantly reduced. The objective of this research was to determine the efficiency of XAD-4 sorbent tubes for trapping cis- and trans-1,3-D isomers as a function of flow rate (100–1000 ml/min) and sampling time period (10 – 360 min). The results show that XAD-4 can trap 1,3-D isomers as efficiently as charcoal and breakthrough occurs depending on the amount of sorbent materials in a tube, fumigant amount, flow rate and sampling time period. No significant breakthrough was observed from either small (120 mg) or large (600 mg) XAD-4 sorbent tubes during short sampling time periods (<30 min) at any flow rate. For longer sampling (3-6 h) at low flow rates (100 ml/min), breakthrough (> 50%) was observed from the small tubes during a 3 h sampling period; but no breakthrough was observed from the large XAD-4 tubes up to the 6 h sampling period when 3.0 mg 1,3-D isomers were tested. At high flow rates (1000 ml/min) during a 3 h laboratory test, however, significant breakthrough was observed from large XAD-4 sorbent tubes suggesting that short sampling time intervals and/or back-up tubes are preferred to avoid potential breakthrough of fumigants from the sampling tubes that can result in underestimating fumigant emissions or concentrations in gas samples.