Students exposed to polluted air on exam day receive lower grades

A study in London found that students exposed to higher levels of indoor air pollution, specifically PM 10, before exams tend to score lower. The research involved 2,418 students and 11,443 exams, revealing that increased PM 10 levels can significantly decrease test scores. Recommendations include limiting outdoor activities on polluted days and choosing less polluted routes to school.

What specific PM 10 level was found to reduce students' test scores by 3.41 percentage points?

What recommendation did the researcher Sophie Rath make regarding outdoor activity on polluted days?