TY  - RPRT
TI  - Air quality data from large cities.
AU  - J M Baldasano
AU  - E Valera
AU  - P Jiménez
PY  - 2003
DO  - 10.1016/s0048-9697(02)00537-5
UR  - https://pubmed.ncbi.nlm.nih.gov/12711431/
ID  - 12711431
ER  -