Drought Intensity, U.S. Drought Monitor

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This layer displays areas that experienced dry or drought conditions in the last seven days. Data are retrieved as shapefiles from the U.S. Drought Monitor and are updated on a weekly basis. The affected areas are represented by polygons, which are classified according to drought intensity. Using quantitative and objective indicators, as well as local condition and impact reports, the U.S. Drought Monitor defines each drought intensity level as follows:

D0 – Abnormally Dry
D1 – Moderate Drought
D2 – Severe Drought
D3 – Extreme Drought
D4 – Exceptional Drought
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For more information about the data, please see the U.S. Drought Monitor Data Classification web page.

Air Toxics – Cancer Risk by Census Tract

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Layer displays the modelled cancer risk associated with air toxics exposure. Figures represents the liklihood of hazardous exposure per 1 million population.

Air Quality – Ozone Levels (O3) by Census Tract, 2014

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This layer displays the daily average concentration of ozone and the percentage of days with concetrations of ozone above the National Ambient Air Quality Standard (NAAQS) of 0.075 parts per million in 2014.

Air Toxics – Cancer Risk by Census Tract

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Layer displays the modelled cancer risk associated with air toxics exposure. Figures represents the liklihood of hazardous exposure per 1 million population.

Air Toxics – Non-Cancer Risk by Census Tract

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Layer displays the modelled non-cancer risk associated with air toxics exposure. A hazard index (HI) of 1 or lower means air toxics are unlikely to cause adverse noncancer health effects over a lifetime of exposure.

Drought Severity, 2019

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This layer displays the percentage of weeks in Any Drought based on analysis of US Drought Monitor weekly drought data files for the year 2019.

Drought Severity, 2017-2019

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This layer displays the percentage of weeks in Any Drought based on analysis of US Drought Monitor weekly drought data files for years 2017-2019.