An environmental research station uses a network of automated sensors to monitor air pollution. Each sensor has a unique alphanumeric Sensor ID. The concentration of fine particulate matter (PM2.5\text{PM}_{2.5}PM2.5, measured in μg/m3\mu\text{g/m}^3μg/m3) is recorded at different times of the day for each sensor.
A two-dimensional array is used to store this pollution monitoring data.
Complete the table to show appropriate column headings and realistic example data for this data structure.