One in five U.M. students has an asthma-related medical condition, and many more suffer from other respiratory problems.

    According to a study by the University of Michigan School of Public Health, one in three students in Michigan has asthma and the state spends $1.8 billion a year on asthma research.

    The researchers wanted to find out why.

    They looked at data from the National Center for Environmental Health and the Centers for Disease Control and Prevention and found that there were a number of factors that contribute to students’ respiratory illnesses.

    For instance, students who were in school and in their home were much more likely to be at high risk of asthma and respiratory problems if their parents worked at a large company or had a family member who did.

    Another factor they identified was that many school bus operators were women.

    About 15 percent of school bus drivers are women, and a third of the drivers work part-time or have lower-paying jobs.

    And the final factor they found was that most students in U.K. public schools have their own school, so they’re often able to spend more time at home.

    The study also looked at how schools’ transportation systems affected the asthma risk.

    In some schools, it could have a positive effect, because they had more accessible buses that were accessible to students.

    But the researchers found that the same effect could occur in public schools with limited access.

    In this case, the effects were much less significant.

    In this case study, the study found that a lack of accessible bus service reduced the asthma prevalence among students.

    The researchers also looked more closely at how bus operators, parents and schools impacted the respiratory health of students.

    The findings of this study show that while schools should invest in accessible and safe school transportation, the system needs to be built with more critical thinking and planning to provide students with the best possible environment.