Pollutants are typically emitted from one of the following types of emission sources:
- Point Source: airflow that is actively controlled and directed (e.g., by fan and exhaust ducting) into the atmosphere from a single stationary fixed source such as a stack or vent. Examples include the boiler exhaust stack, the exhaust stack of a local ventilation system used to capture emissions from processes that emit volatile organic compounds (VOCs).
- Fugitive Emissions Source: for the Higg FEM, fugitive emission sources are those that are passively released into the outdoor environment and are not actively directed through a single exhaust point (e.g., stack or vent). Examples include screen printing, spot cleaning, or dyeing areas with only general ventilation (e.g. passive sidewall ventilation or windows).
- Mobile Emissions Source: for the Higg FEM, mobile emission sources are those that are non-stationary sources of emission. Examples include powered motor vehicles (e.g., forklifts, trucks, passenger vehicles), heavy machinery (e.g., mobile cranes or lifts), and small engines (e.g., landscaping equipment).
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