Data Visualization in Environmental Public Health: From Data to Insight
Figure 2 Line Chart Example: Monthly Inspection Counts
Understanding Change Over Time EPH programs routinely monitor conditions and activities that change over time, whether that is across days, months, or years. Examples include complaint volume, inspection completion rates, environmental monitoring results, and disease trends. Line charts are particularly useful for showing change over time because they let viewers quickly identify increases, decreases, seasonal patterns, and long-term trends. Examples include:
Trend visualizations provide important context. A single value might have limited meaning on its own, but a series of values over time can reveal whether conditions are improving, worsening, or remaining stable. When presenting time-based information, consistent intervals (e.g., days, months, years) and clear labeling are essential to accurate interpretation.
• Monthly mosquito surveillance counts • Annual inspection completion rates • Daily air quality measurements • Quarterly permit activity
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