Carbon monoxide.
D000397:Air Pollution / Q000032:analysis; D000818:Animals; D002248:Carbon Monoxide / Q000378:metabolism / Q000633:toxicity; D002249:Carbon Monoxide Poisoning / Q000150:complications; D002263:Carboxyhemoglobin / Q000378:metabolism; D004781:Environmental Exposure; D005742:Gasoline / Q000633:toxicity; D006801:Humans; D000860:Hypoxia / Q000209:etiology; D008131:London; D008452:Maximum Allowable Concentration; D010100:Oxygen / Q000097:blood; D010313:Partial Pressure; D010507:Periodicity; D012907:Smoking; D013997:Time Factors
D005742:Gasoline; D002248:Carbon Monoxide; D002263:Carboxyhemoglobin; D010100:Oxygen