Environmental justice screening indicators, pollution burden, and demographic vulnerability
Scored across 5 tools
Each tool serves a clearly distinct purpose: demographics, environmental indicators, county EJ summary, state EJ summary, and point-location EJ data. No two tools are likely to be confused despite all relating to EJScreen.
All tools follow a consistent 'get_' prefix followed by a descriptive noun phrase. The pattern is uniform, making it easy to predict tool behavior from names.
Five tools is appropriate for the scope of providing EJScreen data access. Each covers a necessary aspect of the domain without unnecessary redundancy.
The set covers demographic, environmental, county/state summaries, and point-based EJ screening. A minor gap is the lack of a direct block-group lookup by ID, though county/state filtering partially addresses this.
Get demographic vulnerability indicators by block group.
Returns demographic data including minority percentage, low income
percentage, linguistic isolation, education levels, and age
distributions. These are the demographic components used in
EJScreen's EJ index calculations.
Args:
state: Two-letter US state abbreviation (e.g. 'WA', 'CA').
county_fips: Optional county FIPS code (3-digit or 5-digit).
If omitted, returns state-level results sorted by
highest demographic index.
limit: Maximum number of block groups to return (default 50, max 500).
Inputs: state (required), limit, county_fips. Returns: result
Get EJ indicators for census block groups in a county.
Returns EJScreen environmental justice data for block groups within
the specified county, sorted by highest overall environmental burden.
Includes environmental indicators, demographic data, and EJ indexes.
Args:
state: Two-letter US state abbreviation (e.g. 'WA', 'CA').
county_fips: County FIPS code, either 5-digit full (e.g. '53033')
or 3-digit county portion (e.g. '033'). If 3 digits,
state FIPS is prepended automatically.
limit: Maximum number of block groups to return (default 50, max 500).
Inputs: state (required), county_fips (required), limit. Returns: result
Get EJScreen environmental justice data for a specific location.
Uses the EPA EJScreen REST broker to retrieve EJ screening indicators
for a point location with a buffer distance. Returns environmental
indicators, demographic data, and EJ indexes.
Args:
latitude: Latitude of the location (e.g. 47.61).
longitude: Longitude of the location (e.g. -122.33).
distance: Buffer distance in miles around the point (default 1.0).
Inputs: latitude (required), longitude (required), distance. Returns: result
Get a state-level overview of EJ indicators across block groups.
Returns the most environmentally burdened block groups in the state,
sorted by PM2.5 percentile. Useful for identifying areas with the
highest environmental justice concerns.
Args:
state: Two-letter US state abbreviation (e.g. 'WA', 'CA').
limit: Maximum number of block groups to return (default 100, max 500).
Inputs: state (required), limit. Returns: result
Get specific environmental indicators by block group.
Returns environmental indicator values and state percentiles for
block groups. Can filter to a specific indicator type or return all.
Args:
state: Two-letter US state abbreviation (e.g. 'WA', 'CA').
county_fips: Optional county FIPS code (3-digit or 5-digit).
If omitted, returns state-level results.
indicator: Optional specific indicator to focus on. Options:
'pm25', 'ozone', 'diesel', 'cancer', 'respiratory',
'traffic', 'lead', 'superfund', 'hazwaste',
'wastewater', 'rmp', 'ust'. If omitted, returns all.
limit: Maximum number of block groups to return (default 50, max 500).
Inputs: state (required), limit, indicator, county_fips. Returns: result
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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