According to the recent estimates, 300 million of people affected of asthma worldwide and more than 22 million in the United States. Although people of all ages suffer from this disease this will usually begin in childhood, currently affecting 6 million children in the United States. Asthma kills about 255,000 people worldwide each year.
Allergic reactions and asthma symptoms are often the result of air pollution inside the mold or fumes from cleaning products and paints. Other environmental factors associated with asthma are indoor nitrogen oxides from gas stoves. In fact, people who cook with gas are more likely to have symptoms such as wheezing, shortness of breath, asthma and hay fever. Sulfur dioxide, ozone Pollution, nitrogen oxides, cold temperatures and high humidity are all shown to trigger asthma in some people.
During periods of high air pollution there are tend to be increased of asthma symptoms and hospitalizations. Smoggy conditions releasing destructive ingredients known as ozone, which causes coughing, shortness of breath and chest pain. The same conditions emit sulfur dioxide, which also leads to asthma attacks by constriction of the airways.
Climate changes have also been known to stimulate asthma attacks. Cold air can cause respiratory congestion, bronchoconstriction (narrowing of the airways), secretions and decreased mucociliary clearance (another type of inefficiency of the airways). In some populations moisture can cause difficulty breathing.
Risk Factors for Children
Asthma is the most common chronic disease among children – especially children who are underweight at birth, are exposed to tobacco smoke and grew up in an environment with low income. Most children first produce symptoms about 5 years, commencing generally frequent episodes of wheezing with respiratory infections. Additional risk factors for children include having allergies, allergic skin condition eczema or relatives with asthma.
Boys that are young are more likely to develop asthma than girls, but this trend was reversed in adulthood. The researchers speculate that this is due to the small size of the airways of a young man from the airways of a young woman, leading to an increased risk of wheezing after viral infection.