Four scatter plots show variations in raw concentration, pressure, air temperature, and wind speed over time, using data from a 2018 CSV file. Each plot renders an SVG via React and d3.v5, using `scaleTime` and `scaleLinear` for axes and `axisBottom`/`axisLeft` for ticks. The circles are colored steelblue with hover effects, and a brush/Highlight module supports selecting points, highlighting them pink while dimming others.