News on Climate change, air pollution and allergic trigger factors of asthma.

The rising frequency of obstructive respiratory diseases,in particular allergic asthma, observed over the last years, can be partially explained by changes occurring in the environment, with increasing presence in atmosphere of chemical (particulate matter and gaseous components such as nitrogen dioxide and ozone) and biologic (aeroallergens) trigger factors. Aeroallergens are able to stimulate, in allergic subjects, the airways' sensitization, inducing symptoms of bronchial asthma. Over the last 50 years, global earth's temperature has markedly risen likely because of growing emission of anthropogenic greenhouse gas concentrations. Major changes involving the atmosphere and the climate, including global warming induced by human activity, have a major impact on the biosphere and human environment. Urbanization and high levels of vehicle emissions induce symptoms of bronchial obstruction (in particular bronchial asthma) prevalently in people living in urban areas compared with those who live in rural areas. Measures of mitigation need to be applied for reducing future impacts of climate change and global warming on our planet, but until global emissions continue to rise, adaptation to the impacts of future climate variability are required.