IB Environmental systems and societies (ESS - Old) Internal Assessment Exemplar: To what extent does the daily concentration of PM2.5 particulate matter (measured at 8:00a.m and 15:30 p.m) correlate with the severity of reported respiratory symptoms among DP students at SNA school in Binh Chanh District, Ho Chi Minh City, over a 4-week period | RevisionDojo