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NH Environmental Public Health Tracking Program
Air Pollution

National air quality has improved since the early 1990's, but many challenges remain in protecting public health and the environment from air quality problems. Since the 1950s, air quality has been a major public health and environmental concern. Local, state, and national programs have helped us learn more about the problems and how to solve them. NH EPHT Program works closely with NH Department of Environmental Services, the Centers for Disease Control and Prevention (CDC), and the U.S. Environmental Protection Agency (EPA) to track air quality data and to better understand how air pollution affects our health.

Air Pollution and Your Health

Air pollution in the United States poses a public health threat affecting potentially millions of people throughout the country. It is associated with health problems that include increased emergency department visits and hospitals stays for breathing and heart problems, asthma, and increases in illnesses such as pneumonia and bronchitis, and adverse reproductive outcomes such as low birth weight.

Air pollution comes from two main origins: point-sources (factories, construction, houses, businesses, agriculture) and non-point sources (automobiles, trains, buses, vegetation). The EPA lists the most common air pollutants as ground-level ozone, particle pollution (often referred to as particulate matter), nitrogen oxides, sulfur oxides, carbon monoxide, and lead.

Ozone (O3) and fine particulate matter (PM2.5) are the primary pollutants of concern in New Hampshire as they regularly occur at concentrations which can cause harmful health effects. Other contaminants, such as nitrogen-oxides and sulfur-dioxide, occasionally occur at significant concentrations.

Ground level ozone

Ozone is created indirectly when nitrogen oxides and volatile organic compounds mix in the presence of heat and sunlight. Your exposure to ozone depends mainly on where you live and work and how much time you spend outside. Everyone can have health problems from ozone. Symptoms might be very mild or more serious. People with lung disease, children, older adults, and people who are active outdoors are at the highest risk of having problems when ozone levels are unhealthy.

Many scientific studies have linked ground-level ozone contact to varied problems, such as

Particulate Matter

Particle pollution, or particulate matter, consists of particles that are in the air, including dust, dirt, soot and smoke, and little drops of liquid. Fine particulates occur from being directly emitted (e.g., from a smokestack or tailpipe) or from secondary reactions in the air (e.g., when water vapor condenses on sulfate ions, which is also a secondary product of combustion). Some particles, such as soot or smoke, are large or dark enough to be seen. Other particles are so small that you cannot see them. Small particles are the most concerning because they are most likely to cause health problems. Their small size allows these particles to get into the deep part of your lungs. Being exposed to any kind of particulate matter may cause:

Sensitive people, including older adults, people with diseases such as asthma or congestive heart disease, and children, are more likely to be affected by contact with PM2.5.

Reduce Your Risk

EPA's Air Quality Index, or AQI, is a tool to help you quickly learn when air pollution is likely to reach unhealthy levels. Local TV stations, radio programs, and newspapers carry these air quality forecasts to tell you when particle levels are likely to be unhealthy. You can use the AQI to plan your daily activities to reduce exposure to particle pollution.

When particle pollution levels are high, you can:

If you have one of the following diseases, you may experience some effects from particle pollution:

Follow your asthma management plan when particle levels are high.

Coming in contact with particle pollution can cause serious problems in a short period of time, such as a heart attack without any warning signs.

Symptoms, including chest pain or tightness, fast heartbeat, feeling out of breath, and feeling tired more than usual, may be signs of a serious problem. If you have any of these signs, follow your doctor's advice and contact your doctor if the symptoms last longer than usual or worsen.

You may cough more, have chest pain, wheeze, feel like you can’t catch your breath, or be tired more than usual.
You may not be able to breathe as deeply or strongly as you usually do.

Tracking Air Pollution
Tracking air pollution can help people understand how often they are exposed to unhealthy levels of air pollution. Having these data can also help public health professionals or policymakers understand which areas may be most in need of prevention and control activities.

NH EPHT is tracking the following indicators about ozone and PM2.5:

For information about specific health risks associated with ozone and particulate matter:

To read more about air contaminants:

To read more about air pollution and health:

Environmental Public Health Tracking Program
NH Department of Health and Human Services, Division of Public Health Services
29 Hazen Drive, Concord, NH 03301
Tel: (603) 271-4988 800-852-3345 ext.4988

copyright 2009. State of New Hampshire