* WHAT. Temperatures 90 to 100 degrees expected. * WHERE. Santa Ana Mountains and Foothills. * WHEN. From 11 AM this morning to 9 PM PDT Saturday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Dangerously hot conditions with temperatures of 115 to 122 expected. * WHERE. Coachella Valley and San Diego County Deserts. * WHEN. Until 9 PM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with temperatures of 90 to 104 expected. * WHERE. Riverside County Mountains, San Bernardino County Mountains, and San Diego County Mountains. * WHEN. From 11 AM this morning to 9 PM PDT Saturday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with temperatures of 107 to 113 expected. * WHERE. Apple and Lucerne Valleys. * WHEN. Until 9 PM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with temperatures of 98 to 103 degrees. * WHERE. San Diego County Valleys. * WHEN. From 11 AM this morning to 9 PM PDT Saturday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Dangerously hot conditions with temperatures of 100 to 110 degrees, locally up to 112 expected. * WHERE. San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN. From 11 AM this morning to 9 PM PDT Saturday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Temperatures 90 to 100 degrees expected. * WHERE. Santa Ana Mountains and Foothills. * WHEN. Until 9 PM PDT Saturday. * IMPACTS. Hot temperatures may cause heat illnesses.

* WHAT. Dangerously hot conditions with temperatures of 107 to 113 expected. * WHERE. Apple and Lucerne Valleys. * WHEN. Until 9 PM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events. A prolonged period of extreme temperatures will exacerbate impacts from the heat. * ADDITIONAL DETAILS. Today and Saturday are expected to be the hottest days.

* WHAT. Dangerously hot conditions with temperatures of 115 to 122 expected. * WHERE. Coachella Valley and San Diego County Deserts. * WHEN. Until 9 PM PDT Wednesday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events. A prolonged period of extreme temperatures will exacerbate impacts from the heat. * ADDITIONAL DETAILS. This is long-duration heat wave with high temperatures of 115 or higher expected through at least next Wednesday.

* WHAT. Dangerously hot conditions with temperatures 100 to 108 degrees. * WHERE. San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN. Until 9 PM PDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS. Today and Friday will be the hottest days of the week. Moderate to locally major HeatRisk is expected on Sunday with high temperatures 100 to 104 degrees.

* WHAT. Dangerously hot conditions with temperatures 97 to 105 degrees. * WHERE. Riverside County Mountains, San Bernardino County Mountains, and San Diego County Mountains. * WHEN. Until 9 PM PDT Sunday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS. Hottest conditions are expected today and Saturday, with highs in the mid to upper-90s on Sunday.

* WHAT. Dangerously hot conditions with temperatures of 97 to 100, locally up to 103 degrees. * WHERE. San Diego County Valleys. * WHEN. Until 9 PM PDT Saturday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

The South Coast AQMD has issued an air quality alert in inland parts of the South Coast Air Basin and the Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Wednesday through 7 PM Saturday. The South Coast AQMD has issued an air quality alert in the South Coast Air Basin due to high levels of fine particle pollution. The air quality alert is in effect through Friday evening. 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. Exposure to particle pollution can cause serious health problems, aggravate heart and lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with respiratory or heart disease, older adults, and children are particularly susceptible. 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 To help keep indoor air clean during periods of poor air quality, close all windows and doors and run your air conditioner and/or an air purifier. If possible, do not use whole house fans or swamp coolers that bring in outside air. Avoid burning wood in your fireplace or firepit and minimize sources of indoor air pollution such as candles, incense, pan-frying, and grilling. Limit the use of gasoline powered lawn and garden equipment. 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. In the South Coast Air Basin and Coachella Valley, 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. In the Mojave Desert, 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. In Antelope Valley, to view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. in San Diego County, 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 For the latest air quality forecasts and information, visit the website at aqmd.gov.

The South Coast AQMD has issued an air quality alert in inland parts of the South Coast Air Basin and the Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Wednesday through 7 PM Saturday. 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. Exposure to particle pollution can cause serious health problems, aggravate heart and lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with respiratory or heart disease, older adults, and children are particularly susceptible. 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 To help keep indoor air clean during periods of poor air quality, close all windows and doors and run your air conditioner and/or an air purifier. If possible, do not use whole house fans or swamp coolers that bring in outside air. Avoid burning wood in your fireplace or firepit and minimize sources of indoor air pollution such as candles, incense, pan-frying, and grilling. Limit the use of gasoline powered lawn and garden equipment. 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. In the South Coast Air Basin and Coachella Valley, 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. In the Mojave Desert, 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. In Antelope Valley, to view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. in San Diego County, 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 For the latest air quality forecasts and information, visit the website at aqmd.gov.

The South Coast AQMD has issued an air quality alert in inland parts of the South Coast Air Basin and the Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Wednesday through 7 PM Saturday. 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. Exposure to particle pollution can cause serious health problems, aggravate heart and lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with respiratory or heart disease, older adults, and children are particularly susceptible. 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 To help keep indoor air clean during periods of poor air quality, close all windows and doors and run your air conditioner and/or an air purifier. If possible, do not use whole house fans or swamp coolers that bring in outside air. Avoid burning wood in your fireplace or firepit and minimize sources of indoor air pollution such as candles, incense, pan-frying, and grilling. Limit the use of gasoline powered lawn and garden equipment. 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. In the South Coast Air Basin and Coachella Valley, 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. In the Mojave Desert, 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. In Antelope Valley, to view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. in San Diego County, 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 For the latest air quality forecasts and information, visit the website at aqmd.gov.

The South Coast AQMD has issued an air quality alert in inland parts of the South Coast Air Basin and the Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Wednesday through 7 PM Saturday. 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. In the South Coast Air Basin and Coachella Valley, 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. In the Mojave Desert, 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. In Antelope Valley, to view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. in San Diego County, 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 For the latest air quality forecasts and information, visit the website at aqmd.gov.