The investigators propose an intervention study to evaluate if using a cost-effective high-capacity air filter will reduce air pollutants in the homes of asthmatic children and reduce their asthma symptoms. The study will take place in New York City, including East Harlem, a low-income, primarily Latino neighborhood with high asthma prevalence. The investigators hypothesize that a cost-effective single air cleaner placed in the homes of asthmatic children will substantially reduce air pollutants exposure and reduce airway inflammation and asthma symptoms. During the intervention, the study team will continuously monitor indoor air pollution by measuring particulate matter (tiny particles suspended in the air) for one year, verify and incentivize compliance, and conduct two types of breathing tests on the asthmatic child throughout the intervention: 1. One test measures exhaled nitric oxide (a gas collected by blowing air in a portable device, the levels of this gas are higher when there is inflammation in the airways), and 2. The second breathing test is a pulmonary function test (to measure lung capacity and diameter of the airways). The study team will also collect asthma symptom information through questionnaires. If successful, this study will provide evidence for a cost-effective intervention implemented without structural housing changes that can be easily and quickly implemented in homes in low-income urban communities. This study design will utilize a set of air monitors that will allow for high resolution quantification and characterization of particulate matter in the home before the intervention and one-year after placement of the air filter, which will allow researchers to better understand the impact of the filter on home air quality throughout the year. The study team will test the hypothesis that the single filter will substantially reduce particulate matter in the homes of asthmatic children and reduce airway inflammation and asthma morbidity in the child.
