The Clean Air Crusader John Culpepper, Lower Washington Heights Neighborhood Association "See that truck? See that smoke? That's what we're after!" John Culpepper has declared war on dirty air. His weapon: an E-Sampler Particulate Monitor, a portable device that measures PM 2.5--the tiny particles emitted by cars, trucks, buses, factories, power plants and construction sites. PM 2.5 works its way deep into the lungs, aggravating asthma and other respiratory problems. When neighborhood groups want to cut down on the sea of dust, they call John Culpepper. Culpepper, a retired sea merchant and executive director of the Lower Washington Heights Neighborhood Association, started looking into air quality in the mid-1990s, after he learned of the alarmingly high child asthma rates in his community. When the state and federal environmental agencies teamed up to install two dozen air monitoring devices around the city, Culpepper helped get one set up on West 182nd Stre...