Abstract
We evaluated the effect of three types of household deodorizers (Product-A, Product-B, and Product-C) on indoor air quality by measuring indoor ozone (O3) and nitrogen oxides using the developed ozone detection paper and porous glass analytical chip. The average O3 concentration in the vicinity of the air outlet of each household deodorizer was 2.60 ± 0.25 ppm, which was 50 times higher than the WHO guideline value (0.05 ppm) for Product-A and Product-B, and 0.5 times higher than the WHO guideline value for Product-C. Concerning the nitrogen dioxide (NO2) concentration, for which indoor environmental standard values have been established, Product-C had a maximum concentration of 30 ppb, which was less than the guideline values (0.1 ppm and 0.06 ppm) set by the WHO and the school environmental health standard of Japan, while Products-A and -B had concentrations of 810 ± 235 ppb, which was 8 times larger than the WHO guideline value. Furthermore, the average O3 concentration emitted from Product-B decreased with distance z－0.60, and no accumulation of concentration with operating time was confirmed. The average NO2 concentration decreased at z－0.42 and z－0.70 relative to the distance z in the measurements in November 2020 and January 2021, respectively, suggesting the influence of diffusion due to indoor environmental conditions.
Although the use of products-A and -B was not considered to cause accumulation of O3 and NOx concentrations, the concentrations around the air outlets exceeded the standard values, and there was concern about the deterioration of indoor air quality. For Product-C, both O3 and NO2 concentrations were below the guideline values.
