## 3 Results
The average CDI value for formaldehyde over the year is in the store at 3.60 mg/day kg, with a maximum of 6.60 mg/day kg in the sweets department and a minimum of 1.2 mg/day kg in the same department. The average intake is 3 times higher than the average concentration outside of the store (1.17 mg/day kg). The average LCR across the store was 6.7 \(\times\) 10\({}^{-6}\), which means that 6.7 persons at 1,000,000 has a high risk of cancer due to formaldehyde. Thirty-one employees responded to our questionnaire, 22 (70.9%) females. The mean age of the group was 37.3 \(\pm\) 10.4 years old (between 19 and 55 years). One subject was previously known for allergies, none of the subjects had an upper or lower airway infection in the previous week, and four reported concurrent diseases. Two of the four subjects with concurrent diseases reported six and eight symptoms, respectively, while the other two reported having only one symptom from the SBS list. Twenty-three (74%) subjects had at least one symptom, 25.8% had two to three symptoms, and four (12.9%) subjects had four or more symptoms. The median number of symptoms per patient was 1 (IQ range = 0.5-2.5, range: 0-8) (Figure 6A). Regarding the distribution of gender, a similar proportion of male subjects (77.7%) experienced symptoms compared to female subjects (72.7%) (_p_ = 0.77). The employees reporting four or more symptoms were younger (median age 30 years old--range 26-45). The symptoms mentioned more often were fatigue (38.7%), skin problems (22.6%), throat-related issues (22.6%), headache, and flu-like symptoms (each reported by 16.1% of subjects), followed by dry eyes and chest pain (Figure 6B). Figure 5: Monthly variations in PM1 (**A**), PM2.5 (**B**), and PM10 (**C**) concentrations over one-year measurements in 3 different departments and outside. Data with distinct characters indicate significant differences (\(p\) < 0.05), whereas data sharing identical symbols do not exhibit significant differences (\(p\) > 0.05). The values are averages of three independent measurements. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Month**} & \multicolumn{4}{c}{**CDI (mg day\({}^{-1}\) kg\({}^{-1}\))**} & \multicolumn{4}{c}{**HQ**} & \multicolumn{4}{c}{**LCR**} \\ \cline{2-13}  & **Sweets** & **Detergents** & **Plastics** & **Outside** & **Sweets** & **Detergents** & **Plastics** & **Outside** & **Sweets** & **Detergents** & **Plastics** & **Outside** \\ \hline February & 2.32 & 2.38 & 2.82 & 0.92 & 0.13 & 0.13 & 0.16 & 0.05 & 4.43 \(\times\) 10\({}^{-6}\) & 4.54 \(\times\) 10\({}^{-6}\) & 5.38 \(\times\) 10\({}^{-6}\) & 1.76 \(\times\) 10\({}^{-6}\) \\ \hline March & 2.64 & 2.49 & 3.68 & 0.71 & 0.15 & 0.14 & 0.21 & 0.04 & 5.04 \(\times\) 10\({}^{-6}\) & 4.76 \(\times\) 10\({}^{-6}\) & 7.03 \(\times\) 10\({}^{-6}\) & 1.35 \(\times\) 10\({}^{-6}\) \\ \hline April & 6.60 & 4.80 & 4.80 & 0.22 & 0.37 & 0.27 & 0.27 & 0.01 & 1.26 \(\times\) 10\({}^{-6}\) & 9.16 \(\times\) 10\({}^{-6}\) & 4.20 \(\times\) 10\({}^{-7}\) \\ \hline May & 2.40 & 3.08 & 2.29 & 0.25 & 0.13 & 0.17 & 0.13 & 0.01 & 4.58 \(\times\) 10\({}^{-6}\) & 5.88 \(\times\) 10\({}^{-6}\) & 4.37 \(\times\) 10\({}^{-6}\) & 4.73 \(\times\) 10\({}^{-7}\) \\ \hline June & 3.40 & 4.20 & 4.60 & 1.60 & 0.19 & 0.24 & 0.26 & 0.09 & 6.49 \(\times\) 10\({}^{-6}\) & 8.02 \(\times\) 10\({}^{-6}\) & 8.78 \(\times\) 10\({}^{-6}\) & 3.05 \(\times\) 10\({}^{-6}\) \\ \hline July & 2.60 & 4.40 & 5.40 & 2.20 & 0.15 & 0.25 & 0.30 & 0.12 & 4.96 \(\times\) 10\({}^{-6}\) & 8.40 \(\times\) 10\({}^{-6}\) & 1.03 \(\times\) 10\({}^{-5}\) & 4.20 \(\times\) 10\({}^{-6}\) \\ \hline August & 2.48 & 4.20 & 5.82 & 2.02 & 0.14 & 0.24 & 0.33 & 0.11 & 4.73 \(\times\) 10\({}^{-6}\) & 8.02 \(\times\) 10\({}^{-6}\) & 1.11 \(\times\) 10\({}^{-5}\) & 3.86 \(\times\) 10\({}^{-6}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Chronic daily intake (CDI), hazard quotient (HQ), and lifetime cancer risk (LCR) of formaldehyde in different departments of the store and outside.