Cuál es el problema con el aire?
Subtitle: alerta especial para personas con asma y otros problemas respiratorios en el area metropolitana de Chicago, el nordeste de Indiana y el sudeste de Wisconsin.
Contributors: United States. Environmental Protection Agency. Region V.
Publisher: U.S. Environmental Protection Agency, Region 5
Published: 1997
Place of publication: Chicago, IL (77 West Jackson Blvd., Chicago, 60604)
Language: spa
Subjects: Ozone -- Physiological effect; Smog -- Illinois -- Chicago; Air -- Pollution -- Illinois -- Chicago
Notes: Shipping list no.: 97-0330-P.

"July 1997."

"905-K-97-004s."