Data and Tools
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Lead Trends
National and regional trends in lead concentrations.
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Particulate Matter (PM10) Trends
National and regional trends in ambient PM10 and PM2.5 concentrations.
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Nitrogen Dioxide Trends
National and regional trends in ambient NO2.
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Particulate Matter (PM2.5) Trends
National and regional trends in ambient PM10 and PM2.5 concentrations.
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Sulfur Dioxide Trends
National and regional trends in ambient SO2 concentrations.
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Carbon Monoxide Trends
National and regional trends in carbon monoxide.
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Previous Air Quality Trends Reports
Link to archive of historical air quality trends reports
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Air Quality - National Summary
National summary of air quality trends and status
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Modeling Off-Site Transfers in RSEI
Information on how RSEI models off-site transfers to produce scores and other RSEI metrics
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Current EPA-Approved Regulations in the Oklahoma SIP
Current EPA-Approved Regulations in the Oklahoma SIP
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Vulnerable Zone Indicator System (Option 2)
Enter your latitude and longitude to access the Vulnerable Zone Indicator System. VZIS can help you determine if your area could be affected by a chemical accident at a facility that submitted a Risk Management Plan (RMP).
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Vulnerable Zone Indicator System
VZIS can help you determine if your area could be affected by a chemical accident at a facility that submitted a Risk Management Plan (RMP).
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Fact Sheet: BEACH Act Locational Data
Fact Sheet: BEACH Act Locational Data
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National Nonpoint Source Pollution Control Program - Basic Training
National Nonpoint Source Pollution Control Program - Basic Training
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Human Respiratory System Model
The Human Respiratory System Model is a 3-D computational fluid dynamics (CFD) model of the human respiratory system. The model is based on human scan data and can be adapted on the fly to account for age, ethnicity, and sex.
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Receive Notifications about the HELP Model
Request to be notified when updates and bug fixes are made to the HELP Model.
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Current Class VI Projects under Review at EPA
Current Class VI Projects at EPA
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Examples for Assessing Program Effectiveness Through Evaluation
Information related to Develop Risk Communication Programs for Fish and Shellfish Consumption Advisories - Examples for Assessing Program Effectiveness Through Evaluation
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Framework for Effective School IAQ Management
Resources to develop your own program for indoor air quality in schools
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Nutrient Explorer Webinar Archive
This EPA Tools & Resources webinar highlights EPA’s Nutrient Explorer – a downloadable tool for modeling relationships between watershed land use, climate, and other variables and surface water nutrient concentrations.