[Air pollution studies in Mexico City. II. Comparative study for the months of January 1968 and 1970].
D000397:Air Pollution / Q000032:analysis*; D002248:Carbon Monoxide / Q000032:analysis; D008800:Mexico; D009585:Nitrogen Dioxide / Q000032:analysis; D013458:Sulfur Dioxide / Q000032:analysis
D013458:Sulfur Dioxide; D002248:Carbon Monoxide; D009585:Nitrogen Dioxide
Estudios sobre la contaminacion atmosferica de la Ciudad de Mexico. II. Observación comparativa de los meses de Enero de 1968 y 1970.