Sampling and measurements.
D000397:Air Pollution / Q000032:analysis*; D002244:Carbon / Q000032:analysis; D004781:Environmental Exposure; D005579:Fossil Fuels / Q000032:analysis; D006801:Humans; D008131:London; D008722:Methods; D009017:Morbidity; D009026:Mortality; D009519:New York City; D012494:Sampling Studies; D013458:Sulfur Dioxide / Q000032:analysis; D014481:United States
D005579:Fossil Fuels; D013458:Sulfur Dioxide; D002244:Carbon