Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles.
A recent study reported that long-term exposure to air pollution increases the severity of COVID-19 health outcomes, including death, is an important public health objective.
Higher historical PM2.5 exposures are positively associated with higher county-level COVID-19 mortality rates after accounting for many area-level confounders in US.