As public air monitors disappear, federal rollbacks and state laws are making it harder than ever to know what’s in the airAs the US’s network for monitoring air pollution deteriorates, a Floodlight investigation has found that the chemical industry is going state-to-state to restrict one of the few options citizens have left for holding polluters accountable: low-cost air sensors.Over the past two years, the non-profit investigative newsroom determined, lawmakers in Louisiana, Kentucky and