Vital Signs: EN1 - Air Quality Sensor Locations

Data is collected at specific sensor sites operated by the Air District that capture the concentration of fine particulate matter (PM2.5) in the air; sensor locations may change over the years and thus only minor relocations are shown as the same station in this analysis (e.g., sensor moved across the street from its prior location). Data either reflect the annual average or the 98th percentile day (worst-case conditions); some data are reported as three-year rolling averages to minimize noise associated with any given year. The worst location site may shift from year to year depending on which sensor location had the highest levels of fine particulate matter over that particular time period. The regional trend reflects the average of eight sensors that were available throughout the analysis time period, using an iterated 2-way ANOVA for interpolation in gap years.