Air Pollution Control District Air Basins

The APCD Air Basin boundaries are derived following descriptions set forth in APCD Rule 101 - Burning Control: Regulation IV, Rule 101, Part (c) Definitions, Section (25) "San Diego Air Basin" - descriptions follow township and range boundary lines that define the eastern boundary of the San Diego Air Basin. The western boundary is the coast, Southern boundary is international border, northern boundary is S.D. County line. East of SD Air Basin is the Salton Sea Air Basin. SEE BELOW.

The San Diego Air Basin is defined as follows: except that portion which lies east of a line beginning at the U.S.-Mexico border and running north along the range line common to R. 7 E and R. 6 E, San Bernardino Base and Meridian; to the southeast corner of T. 16 S, R. 6 E; then west along the township line common to T. 16 S and T. 17 S to the southwest corner of T. 16 S, R. 6 E; then north along the range line common to R. 6 E and R. 5 E to the southeast corner of T. 14 S, R. 5 E; then west along the township line common to T. 14 S and T. 15 S to the point of intersection with the east boundary of Cuyamaca Park; then north along the east boundary of Cuyamaca Park to the point of intersection with the range line common to R. 5 E and R. 4 E; then north along this range line to the point of intersection with the south boundary of the San Felipe Land Grant; then east and north along the land grant boundary to the easternmost corner; then continuing west and north along the land grant boundary to the point of intersection with the range line common to R. 5 E and R 4 E; then north along this range line to the point of intersection with the township line common to T. 10 S and T. 9 S; then west along this township line to the point of intersection with the range line common to R. 4 E and R. 3 E; then north along this range line to the San Diego-Riverside County boundary.