School Inner City Air Study

Inclusion Criteria: Children * Grades K-5 (age 6-12 years) * Attend one of the schools that the study team has permission to obtain classroom/school environmental samples * Have no plans to move schools within the upcoming 12 months * Subject and/or parent guardian must be able to understand and provide informed consent and also willing to participate in the study Adults * Adult (age 21 or older) parent, caretaker, or household member of child participating in this study, or teacher in classroom participating in study * Able to understand and provide informed consent Exclusion Criteria: Children * Contraindication to or inability to participate in home self-collection of nasal swab samples * Severe chronic diseases (e.g. cancer, genetic or congenital disorders interfering with mobility) * Severe neurobehavioral, neurodevelopmental or psychiatric disorders requiring special assistance * Families who do not speak English or Spanish well enough to complete the survey questions, as validated versions in other languages are not available for all of the measures Adults * Contraindication to or inability to participate in home self-collection of nasal swab samples * Severe chronic diseases (e.g. cancer, genetic or congenital disorders interfering with mobility) * Severe neurobehavioral, neurodevelopmental or psychiatric disorders requiring special assistance * Families who do not speak English or Spanish well enough to complete the survey questions, as validated versions in other languages are not available for all of the measures