How many people in the world are allergic to dust?

It's estimated that around 20 million people in the United States alone are allergic to dust mites, a common allergen found in household dust. Globally, this number is likely in the hundreds of millions, considering the prevalence of dust mite Allergies in various populations. However, exact figures are difficult to determine due to varying rates of diagnosis and reporting across different countries. Dust allergies can also be influenced by environmental factors and living conditions.