Filtered emission through diesel-powered engines may aggravate respiratory allergy more as compared to the unfiltered emissions, according to novel research uploaded in the American Journal of Respiratory and Critical Care Medicine.
This shocking result may be for the reason that a few particle-depletion technologies, comprising the one used by the scientists, increase the nitrogen dioxide (NO2) amounts in the exhaust. NO2, which is one of the major concerns for national air quality standards, has the capability of significantly reducing the lung function and may be a reason for asthma in children.
In the research, 14 non-smoking adults opted, who were susceptible to at least one of three widespread allergens.
Chris Carlsten—senior author of the study—said that previously, the researchers verified that the allergic responses were increased and the airflow declines were noticed in the genetically susceptible people by regular inhalation of diesel exhaust. However, they also speculated if eliminating particles from the exhaust air would minimize these effects.
In this traverse study, all 14 contestants were exposed to air comprising just the allergen, filtered diesel exhaust plus allergen, and the unfiltered diesel allergen exhaust comprising allergen in a laboratory at different intervals. They were all also inhaled fresh air without any diesel exhaust or allergen, which served as the control condition.
The research findings concluded that the diesel exhaust emitted after passing through HEPA filtration and electrostatic precipitation produced higher intensities of NO2 than unfiltered diesel exhaust. The contestants were able to forcibly exhale more amount of air in one second (FEV1) through the exposure to filtered diesel exhaust with allergen as compared to the fresh air comprising allergen alone and unfiltered diesel exhaust along with allergen. Filtered diesel exhaust inhalation may lead to a significant reduction in lung function, particularly in those participants who are heritably prone to oxidative stress.
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