* WHAT. Temperatures 98 tp 105 degrees expected. * WHERE. San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN. From 10 AM Saturday to 8 PM PDT Sunday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Elevations over 6,000 feet up to 85 degrees. Elevations over 2,000 up to 95 expected. * WHERE. Riverside County Mountains, San Bernardino County Mountains, and San Diego County Mountains. * WHEN. From 10 AM to 8 PM PDT Saturday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Temperatures in the 90s to around 102 degrees expected with warm overnight low temperatures in the 60s to lower 70s offering little reprieve from the heat. * WHERE. Cuyama Valley, Los Angeles County Valleys, and the San Luis Obispo County Valleys and Mountains. * WHEN. From 10 AM Saturday to 8 PM PDT Sunday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Temperatures in the 90s to around 102 degrees expected with warm overnight low temperatures in the 60s to lower 70s offering little reprieve from the heat. * 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. Highs from 98 to 105. * WHERE. The Inland Empire. * WHEN. From 10 AM Saturday to 8 PM PDT Sunday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Highs 90 to 95 from elevations between 3,000 and 6,000 feet. * WHERE. Riverside County Mountains, San Bernardino County Mountains, and San Diego County Mountains. * WHEN. From 10 AM to 8 PM PDT Saturday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Dangerously hot with highs from 100 to 106. * WHERE. Apple and Lucerne Valleys. * WHEN. From Saturday morning through Sunday evening. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

The South Coast Air Quality Management District has issued an Air Quality Alert due to elevated ozone air pollution. This Air Quality Alert is in effect from 11 AM Friday to 7 PM PDT Tuesday. Elevated levels 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 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 the 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) are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adult 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 time outdoors. As Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoors 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. For the additional information, call the South Coast Air Quality Management District.