## 3 Results  
Total pollen counts for all pollen types under all experimental conditions can be found in Supplemental Table S1. To begin our analysis, we first compared all data points from all testing conditions to look at the residuals for fit of the overall model. A repeating downward pattern emerged after data point 676 (Figure 6). This is the point at which the experiment shifted from testing pine pollen to testing pecan pollen, indicating that the behavior of the experiment at different target levels of pollen was different for pecan pollen than it was for pine pollen. Therefore, we separated the data according to pollen type for further analysis. First, we looked at lodgepole pine pollen. The distribution of lodgepole pine pollen in a closed environment was affected by the presence of a diffuser containing lavender essential oil (Figure 7). The difference between diffuser off and a diffuser running with RO water only was small. In most cases, except for the 0.5 g pollen, adding lavender essential oil to the diffuser led to a distinct increase in the amount of pollen found on the slides, which indicates that lavender essential oil had an effect on reducing the amount of pollen in the air. Similar results were seen when this was repeated with the blends Citrus Fresh(tm) and Thieves(r) (Figure 8). Across all experiments, the amount of pollen introduced into the terrarium had no effect on how much pollen was found on the slides, other than the predictable linear effect, which can be seen in Figure 7. The average pollen counts of lodgepole pine pollen for each test condition are given in Table 2, and includes the variation caused by the different target levels of pollen introduced to the environment. counts than Citrus Fresh(tm). Note that the lavender value 3.6394 is marginally higher than Citrus Fresh(tm) (p-value of 0.0344) whereas Thieves(r) has essentially the same value as Citrus Fresh(tm). The three essential oils show a statistically significant higher pollen count on the plates than either the \"Diffuser on (water only)\" or the \"Diffuser off\" status. Lavender is slightly higher than either the Citrus Fresh(tm) or the Thieves(r) conditions. There is no statistical evidence that having the \"diffuser on (water only)\" is better than \"diffuser off.\"  
Pecan pollen results were somewhat different than lodgepole pine pollen. With pecan pollen, only three conditions were tested: diffuser off, diffuser on (water only), and diffuser on (water + lavender). Citrus Fresh(tm) and Thieves(r) were not tested with pecan pollen primarily since they did not perform quite as well as lavender in the previous experiment. Mean pollen counts can be found in Table 4 and full results are in Figure 9.  
Figure 9: The amount of pecan pollen found on the microscope slides in an environment with diffuser off (blue), with diffuser on (water only) (orange), and with a diffuser containing 10 drops of lavender essential oil (grey). Note: Each data point on the graph is the average pollen count of 27 data points. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Diffuser Conditions** & **Observed Mean** & **Observed Standard Error** & _p-Value_ \\ \hline Total Pollen (Citrus Fresh(tm)) & 691.5628 & 20.1667 & \textless{}0.0001 \\ Diffuser on (water + lavender) & 3.6394 & 1.7177 & 0.0344 \\ Diffuser on (water + Thieves(r)) & \(-\)0.1672 & 1.7177 & 0.9224 \\ Diffuser on (water only) & \(-\)8.8683 & 1.7177 & \textless{}0.0001 \\ Diffuser off & \(-\)6.3846 & 1.7177 & \textless{}0.0001 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Mean and standard error for each set of experimental conditions run on lodgepole pine pollen. The values for the different experimental conditions represent the averaged values of the additional or decreased amounts of pollen relative to the count for Total Pollen Citrus Fresh(tm).