* WHAT. Temperatures up to 95 to 100 expected. * WHERE. Cuyama Valley, Eastern San Fernando Valley, Los Angeles County San Gabriel Valley, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Clarita Valley, Southern Salinas Valley, and Western San Fernando Valley. * WHEN. From 10 AM Saturday to 8 PM PDT Sunday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Temperatures up 95 to 102 expected. * WHERE. Cuyama Valley, Eastern San Fernando Valley, Los Angeles County San Gabriel Valley, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Clarita Valley, Southern Salinas Valley, and Western San Fernando Valley. * WHEN. From 10 AM this morning to 8 PM PDT Sunday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Temperatures up to 103 expected. * WHERE. Cuyama Valley, Eastern San Fernando Valley, Los Angeles County San Gabriel Valley, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Clarita Valley, Southern Salinas Valley, and Western San Fernando Valley. * WHEN. Until 8 PM PDT Sunday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Temperatures up to 103 expected. * WHERE. Cuyama Valley, Eastern San Fernando Valley, Los Angeles County San Gabriel Valley, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Clarita Valley, Southern Salinas Valley, and Western San Fernando Valley. * WHEN. Until 8 PM PDT Sunday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Temperatures up 90 to 100 expected. * WHERE. A large portion of Los Angeles, Ventura, Santa Barbara, and San Luis Obispo Counties away from the coast. * WHEN. Until 8 PM PDT Sunday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Highs from 100 to 105. * WHERE. The Inland Empire. * WHEN. From 10 AM this morning to 8 PM PDT Sunday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Dangerously hot with highs from 100 to 105 degrees. * WHERE. Apple and Lucerne Valleys. * WHEN. From 10 AM this morning to 8 PM PDT Thursday. * IMPACTS. Heat related illnesses increase during extreme heat events.

* WHAT. Highs from 90 to 98. * WHERE. Riverside County Mountains, San Bernardino County Mountains, and San Diego County Mountains. * WHEN. From 10 AM this morning to 8 PM PDT this evening. * IMPACTS. Hot temperatures may cause heat illnesses.

The South Coast AQMD has issued an air quality alert in the South Coast Air Basin and Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Friday through 7 PM Tuesday. Elevated levels of ozone the predominant summertime pollutant are likely to result in poor air quality in the afternoon and early- evening hours. Ozone air pollution can cause respiratory health problems, including trouble breathing, asthma attacks, and lung damage. Children, older adults, and people with asthma or COPD may be more sensitive to the health effects of ozone. Air quality can change depending on time of day and weather conditions. Increased emissions of chemicals and faster ozone formation rates due to heat, along with low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. To help minimize ozone air pollution levels: * Limit the use of gasoline powered lawn and garden equipment until evening hours * Conserve electricity and set your air conditioner at a higher temperature * Try to delay trips to the gas station and the use of household chemicals until the evening Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. To view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. To view current and forecasted air quality levels, visit the Mojave Desert Air Quality Management District website at mdaqmd.ca.gov. Additional details for this air quality alert may be available at www.mdaqmd.ca.gov/advisories. To view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. To view current and forecasted air quality levels, visit the San Diego County Air Pollution Control District website at www.sdapcd.org/content/sdapcd/air-quality.html. Additional details for this air quality alert may be available at www.sdapcd.org/content/sdapcd/air-quality/smoke-advisory.html