The South Coast Air Quality Management District posted first-stage smog alerts Tuesday in the Eastern San Fernando Valley and the Western San Gabriel Valley. The alerts were called at 2 p.m. when the Pollutants Standard Index levels reached 205 and 200, respectively.
At 4 p.m., the AQMD posted additional alerts in parts of Riverside and San Bernardino counties.
An AQMD spokeswoman said the smog was expected to be even worse today, with first-stage alerts predicted for 10 of the AQMD's 34 air-monitoring areas, including all of the San Fernando and San Gabriel valleys and parts of San Bernardino and Riverside counties.
The AQMD advises that children and the elderly remain indoors during first-stage smog alerts.