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Air pollution from California's construction equipment is harmful
to Californians. Construction equipment is the second largest
source of diesel pollution in the state, accounting for 20% of
particulate matter soot) and 16% of smog-forming Nitrogen Oxides
(NOx). These pollutants are two of the biggest pollution hazards
for public health in California and throughout the country.

Exposure to these pollutants has serious effects on respiratory
health. Inflammation and irritation of the respiratory tract can
cause shortness of breath, throat irritation, chest pains and
coughing, and lead to asthma attacks, hospital admissions and
emergency room visits.
 
Particulate air pollution or soot can be inhaled and reach deep
into the lungs. These tiny particulates can enter the circulatory
system and damage blood vessels. Particulate pollution is
associated with heart attacks, irregular heartbeat, asthma
attacks, reduced lung function and bronchitis. 

These health impacts result in tens of thousands of premature
deaths in the U.S. from heart and lung disease annually, as well
as hospital admissions, emergency room visits, absences from
school or work, and restricted activities related to asthma
attacks. Children are especially vulnerable because their lungs
are still developing.