* WHAT. An Excessive Heat Warning has been issued for San Francisco for dangerously hot conditions with temperatures up to 96 expected in portions of the city. * WHERE. San Francisco. * WHEN. The Excessive Heat Warning will begin at 10 AM this morning, and be valid until 8 PM PDT this evening. The Excessive Heat Warning will then become a Heat Advisory from 8 PM this evening until 11 PM PDT Wednesday. * IMPACTS. Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.

* WHAT. Dangerously hot conditions with high temperatures up to 114 expected. Low temperatures in the northern Coachella Valley mostly in the 80s. * WHERE. San Gorgonio Pass Near Banning. * WHEN. From 10 AM this morning to 8 PM PDT Thursday. * IMPACTS. Heat related illnesses increase significantly during extreme heat events.

* WHAT. Hot temperatures 97 to 106 degrees expected with warm overnight lows in the 60s to mid 70s. * WHERE. Carquinez Strait and Delta, Sacramento Valley, Northern San Joaquin Valley, and the foothills. * WHEN. From 11 AM this morning to 11 PM PDT Wednesday. * IMPACTS. Heat related illnesses will be possible, especially for groups that are sensitive to heat. * ADDITIONAL DETAILS. Widespread Moderate HeatRisk is expected across the Valley and Delta, with Major HeatRisk in the foothills. Limited overnight cooling expected in the foothills. This level of heat may impact outdoor activities.

The South Coast AQMD has updated an air quality alert due to increased fine particle pollution from wildfire smoke in the region. The air quality alert is in effect until 2:00 PM on Tuesday. If you smell smoke or see ash due to a wildfire, remain indoors with windows and doors closed or seek alternative shelter, if feasible. Avoid vigorous physical activity 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. If you must be outdoors, keep the time brief and wear a tightly-fitted N-95 or P- 100 respirator to help reduce exposure. Limit the use of gasoline powered lawn and garden equipment. Exposure to particle pollution can cause serious health problems, aggravate lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with heart or lung diseases should follow their doctor's advice for dealing with episodes of unhealthy air quality. Additionally, people with respiratory or heart disease, older adults, and children are particularly susceptible and should avoid prolonged exposure, strenuous activities or heavy exertion as conditions dictate. Levels of particle pollution can vary hour by hour and by location depending on fire behavior and local weather conditions. 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. For the latest air quality forecasts and information, visit the website at aqmd.gov.

* WHAT. An Excessive Heat Warning has been issued for San Francisco for dangerously hot conditions with temperatures up to 96 expected in portions of the city. * WHERE. San Francisco. * WHEN. For the Heat Advisory, until 10 AM PDT this morning. For the Excessive Heat Warning, from 10 AM PDT this morning until 11 PM PDT Wednesday. * IMPACTS. Extreme heat will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.