Hi, I need help with my assignment please.

1. What is the difference between Active and passive sampling? 2. What is the difference between Instantaneous (real-time) and integrated (continuous) monitoring? 3. Why do we calibrate our sampling equipment and what is the difference between a primary and secondary calibration. What were the types of primary and secondary calibrators we used in lab for air sampling? What is the difference between flash point, LEL and UEL? 5. What are the different types of particulate matter