Very small (fine) particulate matter (PM) concentrations approach or exceed the National Ambient Air Quality Standard in several National Park Service (NPS) areas. The NPS therefore issues fine particulate health advisories at several areas.
What is particulate matter?Particle pollution is made up of a mixture of microscopic solids and liquid droplets suspended in air. This pollution, also known as particulate matter, includes acids (such as nitrates and sulfates), organic chemicals, metals, soil or dust particles, and allergens (such as fragments of pollen or mold spores). How can particulate matter affect your health?Particle exposure can lead to a variety of health effects. Both long- and short-term particle exposures have been linked to health problems. Long-term exposures, such as those experienced by people living for many years in areas with high particle levels, have been associated with problems such as reduced lung function, the development of chronic bronchitis, and even premature death. Short-term exposures to particles (hours or days) can aggravate lung disease, causing asthma attacks and acute bronchitis, and may also increase susceptibility to respiratory infections. In people with heart disease, short-term exposures have been linked to heart attacks. What are the symptoms of particle exposure?Even if you are healthy you may experience temporary symptoms such as irritation of the eyes, nose, and throat, coughing, phlegm, chest tightness, and shortness of breath when particulate conditions are poor. If you have lung disease, you may not be able to breathe as deeply or as easily as you normally can, and you may experience coughing, chest discomfort, wheezing, shortness of breath, and unusual fatigue during periods of elevated particulate matter pollution. People with heart or lung disease, diabetics, older adults, and children are considered at greater risk from particulate matter pollution than other people, especially when they are physically active. Exercise and physical activity cause people to breathe faster and more deeply, which draws more particles into their lungs. People sensitive to particulate matter include:
When particulate pollution occurs, your chances of being affected increase with strenuous activity and the length of time you are active outdoors. If your planned activity involves prolonged or heavy exertion and the particulate levels are high, you may want to limit or discontinue your activity. Air quality in some parks may at times exceed the National Ambient Air Quality Standard for fine particulate matter. This is also known as PM2.5, which are particles less than or equal to 2.5 micrometers (µm). Elevated levels of PM2.5 in National Park Service areas may come from smoke associated with forest fires within and near the parks. Understanding PM2.5 Health Advisory levels
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Last updated: October 24, 2024