Sector: Natural sources
GEOS-Chem is an open?source global 3?D chemical transport model used to simulate atmospheric composition, including gases and aerosols, and their chemistry, transport, and deposition. The website provides documentation, installation and run instructions, tutorials, model version information, input datasets, and links to the user community and developer resources. Researchers use it to run simulations for air quality, climate, and biogeochemical cycling studies, and to contribute improvements back to the shared codebase.
Suite of tools providing urban and rural forestry analysis and benefits tools. i-Tree quantifies forest structure and estimates the environmental and economic benefits of trees.
Website providing information on Michigan’s supplemental environmental projects program, which manages environmentally beneficial projects that are not required by state or federal law, but an alleged violator agrees to undertake as part of a settlement of an enforcement action. SEPs are projects that go beyond what is legally required to return to compliance with applicable state and federal laws.
Document providing basic information on methods for reducing dust emissions
Climate TRACE is a global emissions tracking initiative and online platform that uses satellite observations, remote sensing, and other independent data—combined with AI and machine learning—to estimate greenhouse gas emissions from specific countries, sectors, and large facilities in near real time. It provides publicly accessible maps, dashboards, and downloadable data that let users see where emissions are coming from, how they change over time, and how reported inventories compare to independent estimates, supporting greater transparency and accountability in climate action.
EPA’s Community Multiscale Air Quality (CMAQ) modeling system is an open-source, regional air quality model used to simulate how pollutants such as ozone, PM2.5, and air toxics form and move in the atmosphere. It combines detailed atmospheric chemistry, emissions, and meteorology to estimate pollutant concentrations and deposition over time and space. The CMAQ website provides the model code, documentation, tutorials, input datasets, and example applications, supporting researchers and agencies in evaluating air quality policies, health and ecosystem impacts, and interactions between air quality and climate.
NOAA’s HYSPLIT (Hybrid Single-Particle Lagrangian Integrated Trajectory) website provides access to a powerful atmospheric transport and dispersion model used to simulate how airborne pollutants, smoke, dust, volcanic ash, and other particles move and spread in the atmosphere. The site offers model documentation, tutorial materials, downloadable desktop software, and online web-based tools that let users calculate air parcel trajectories, dispersion, and deposition patterns based on meteorological data. It is widely used for air quality studies, emergency response, and research on long-range transport of contaminants.
Website providing information on state, Tribal, and federal implementation plans. Information included on approved state regulations, source specific requirements, and nonregulatory provisions.
Website that provides access to information on local government strategies to reduce emissions of air pollution. Includes information for mobile sources, area, non-road, and stationary sources. Includes model ordinances and policies.
