Air Pollutants and Health Effects

Particulate Matter

Particulate Matter, or “soot,” is made of microscopically small particles, either solid or liquid. The smaller the particles, the deeper they can penetrate into the respiratory system, which causes more significant health problems.

Particles less than 10 micrometers in diameter can cause significant health problems. Particles under 2.5 micrometers, called “fine” particles, are considered the most dangerous. Fine particles can easily bypass filters in the nose and throat and penetrate deep into the lungs. Wood smoke from woodstoves and fireplaces is the major source of fine particulate matter in the wintertime in the Bay Area.

Health Effects

Lung Irritation

This can lead to increased permeability, or the ability of liquids and gases to pass through to the lungs.

Lung Tissue Inflammation

As a result, chemicals can be released that can impact heart function.

Greater Severity of Chronic Lung Diseases

This can lead to the rapid loss of airway function.

Changes in Blood Chemistry

Clots can then occur that lead to heart attacks.

Increased Viral and Bacterial Pathogen Susceptibility

Vulnerable people who are unable to clear these infections can contract pneumonia.

Since the 1980s, many scientific studies have been published that correlate the exposure to wood smoke and particulate matter with serious public health effects, such as higher instances of asthma, decreased lung function in children, increased hospital admissions, and elevated mortality rates.

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San Francisco Bay Area
Air Quality Status
Sunday, 8/25
No Alert

5-Day Air Quality Forecast
Sat
Sun
Mon
Tue
Wed
Northern Zone
57
55
M
G
G
Coast and Central Bay
57
61
M
M
M
Eastern Zone
67
93
M
M
M
South Central Bay
50
53
M
M
G
Santa Clara Valley
58
84
M
M
M
Sunday, August 25
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