This study shows that the rate of particle emission during normal human speech is positively correlated with the loudness of vocalization. Speech produces a large number of particles too small to see, which can carry respiratory pathogens. The study found that the particle emission rate increases with the amplitude of speech, ranging from approximately 1 to 50 particles per second, regardless of the language spoken. Some individuals, called "speech superemitters," consistently release an order of magnitude more particles than their peers. These results suggest that individual differences in speech patterns and particle emissions may contribute to the transmission of respiratory pathogens. The study also indicates that speech superemitters may play a role in the phenomenon of superspreading, where a few individuals infect a disproportionately large number of others during outbreaks. The study further shows that speech emits more particles than breathing, and that the size of these particles is slightly larger than those from breathing. The findings highlight the importance of loud speech in increasing the transmission of airborne infectious diseases. The study also suggests that individual physiological factors may influence the emission of particles during speech, and that further research is needed to understand the mechanisms behind these variations. The results have important implications for public health, as they suggest that loud speech could increase the risk of transmission of respiratory pathogens.This study shows that the rate of particle emission during normal human speech is positively correlated with the loudness of vocalization. Speech produces a large number of particles too small to see, which can carry respiratory pathogens. The study found that the particle emission rate increases with the amplitude of speech, ranging from approximately 1 to 50 particles per second, regardless of the language spoken. Some individuals, called "speech superemitters," consistently release an order of magnitude more particles than their peers. These results suggest that individual differences in speech patterns and particle emissions may contribute to the transmission of respiratory pathogens. The study also indicates that speech superemitters may play a role in the phenomenon of superspreading, where a few individuals infect a disproportionately large number of others during outbreaks. The study further shows that speech emits more particles than breathing, and that the size of these particles is slightly larger than those from breathing. The findings highlight the importance of loud speech in increasing the transmission of airborne infectious diseases. The study also suggests that individual physiological factors may influence the emission of particles during speech, and that further research is needed to understand the mechanisms behind these variations. The results have important implications for public health, as they suggest that loud speech could increase the risk of transmission of respiratory pathogens.