What part of the country had the highest number of census tracts above the EPA action level for PM2.5 on average during the most recent period that data is available (2011-2015)?

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First, consider what the question asks: which part of the country had the highest average number of census tracts above the EPA action level for PM2.5 during 2011-2015. This requires knowledge of regional air quality distributions and the historical EPA action levels for PM2.5.
Option: New Jersey. While some northeastern areas have elevated PM2.5 levels, New Jersey is not typically cited as having the highest average number of tracts above the action level across the nation; other regions often show higher tract counts due to sparser population in rural areas combined with persistent aerosol conditions elsewhere.
Option: Chicago Metro area. The Chicago area experiences significant PM2.5, especially in winter months, but national patterns generally show higher tract counts in other regions, particularly where emissions and meteorology contribute to more widespread exceedances. It is unlikely to be the top region on average across 2011-2015.
Option: Louisiana. Louisiana has industrial activity and some high PM sources, yet the state overall does not consistently rank at the top for the number of tracts above the EPA action level when compared to other regions with dense nonattainment zones or high valley- or basin-averaged concentrations. This makes it a less likely candidate for the highest average tract exceedances.
Option: Eastern Texas. This area does experience PM2.5 challenges, particularly near urban centers and industrial corridors, but regional assessments for 2011-2015 often point to other parts of the country with a larger aggregate of tracts above the action level, reducing the likelihood that Eastern Texas would hold the top spot across the nation.
Option: California Central Valley. The Central Valley has long been a focal point for PM2.5 and PM10 air quality concerns due to intensive agricultural activity, vehicle, and industrial emissions, combined with meteorological conditions that trap pollutants. Historically, this region has shown a notably high number of census tracts above the EPA action level for PM2.5, frequently ranking at or near the top in national assessments for that period.
In summary, evaluating regional patterns of PM2.5 exceedances during 2011-2015, the California Central Valley emerges as the region most consistently associated with higher counts of tracts above the action level, compared to the other regions listed.

ETX 010 001 SQ 2025 Learning Assignment 24

What part of the country had the highest number of census tracts above the EPA action level for PM2.5 on average during the most recent period that data is available (2011-2015)?

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