## 3 Results and Discussion
### Control Sampling  
To establish a baseline for comparison, airborne particles were sampled the day before the festival in the same park that hosted the fireworks. Figure 3 shows SEM images of airborne particles \"as-trapped\" using the drone carbon tape system developed for this study. This baseline allowed for distinguishing firework-generated particles from other pollutants.  
Figure 2: Map of sampling location in relation to observed firework origin courtesy of Google Maps via atlist.com.  
Figure 3a is an SEM image of typical capture structure, which has a non-spherical shape with a \"rocky-like\" overall appearance. Figure 3(a2) shows a higher-magnification image of a selected area on the surface of the structure in Figure 3a, revealing both smooth and textured regions that appear porous in nature. The EDX point analysis conducted on a selected area of the particle in Figure 3a shows X-ray signatures for O, Na, Al, and Si (Figure 3(a3)). The peaks for Si and O are much more prominent than those for Na and Al, indicating that the analyzed region is predominantly composed of Si and O. The presence of a Na peak suggests some form of salt in the particle, while the Al peak could indicate environmental background pollution. Aluminum is commonly found in trace amounts in pollutants generated by automobile engines, which could explain its presence, as sampling was conducted near a large university campus with major roads nearby [29]. Figure 3b shows a SEM image of another group of non-spherical particles with two \"rocky-like\" appearance. The elemental analysis of this particle, shown in Figure 3(b2), reveals two clear peaks corresponding to O and Si. Figure 3c displays another type of \"rocky-like\" appearance, but it has a more elliptical shape and lacks the sharp edges or corners seen in the other trapped particles. The elemental analysis of this particle, seen in the spectrum in Figure 3(c2), reveals three peaks, with major peaks for O and Si, alongside a minor peak for Al. All three samples contained a majority of Si and O, suggesting the presence of SiO\({}_{2}\) in these particles. This finding is supported by literature, as silicon dioxide is one of the most common minerals on Earth's surface and a major component of various soil compositions worldwide [30]. The particles and elements in the control sample suggest that any detectable particulate matter in the environment on the sampling day is likely to be dust or dirt, swept up by wind.  
Figure 3: Assorted SEM images of representative particulates collected from airborne control samples: (**a**) single non-spherical particulate; (**a2**) high-resolution image of a selected area on the surface of the particulate in (**a**), corresponding to the white dashed arrow, revealing a porous region; (**a3**) EDX spectrum associated with the selected area (PRE1 Point), as indicated by the solid white arrow in (**a**); (**b**) SEM image of a pair of non-spherical particles; (**b2**) EDX spectrum associated with the particle in (**b**) (PRE2 Point), as indicated by the solid white arrow; (**c**) SEM image of another representative non-spherical particle collected in the control sample; (**c2**) EDX spectrum associated with a selected point (PRE3) in (**c**), as indicated by the solid white arrow in the corresponding SEM image.