In this context, sensitive groups refer to individuals who are more vulnerable to the adverse health effects of poor air quality related to fine particles (PM2.5). This includes individuals with pre-existing health conditions such as asthma, chronic obstructive pulmonary disease (COPD), cardiovascular disease, and diabetes, as well as the elderly, children, pregnant women, and outdoor workers. The California Occupational Safety and Health Standards require employers to provide their workers with proper respirators if the AQI PM2.5 is 151 or greater, which is the "unhealthy" level of concern. At AQI 101-150, which is "unhealthy for sensitive groups", individuals who are not members of a sensitive group may still experience eye, nose, or throat irritation, coughing, phlegm, chest tightness, or shortness of breath.
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