* WHAT...Dangerously hot conditions. Afternoon temperatures 108 to
116. Major Heat Risk. Overexposure can cause heat cramps and heat
exhaustion to develop and, without intervention, can lead to heat
stroke.

* WHERE...Portions of southeast and southern California.

* WHEN...Until 8 PM PDT this evening.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

An Extreme Heat Warning means that a period of very hot
temperatures, even by local standards, will occur. Actions should be
taken to lessen the impact of the extreme heat.

Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose-fitting clothing when possible
and drink plenty of water.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

Public cooling shelters are available in some areas. Consult county
officials for more details.

* WHAT...High temperatures of 98 to 107 expected.

* WHERE...San Bernardino and Riverside County Valleys-The Inland
Empire.

* WHEN...Until 8 PM PDT this evening.

* IMPACTS...Hot temperatures may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

* WHAT...The South Coast AQMD has issued an air quality alert due to
harmful levels of ozone pollution.

* WHERE...In inland Orange County, the Santa Ana Mountains, the
Inland Empire, the San Bernardino Mountains, the Riverside County
mountains and the Coachella Valley. Levels of ozone pollution can
vary by time and location depending on emissions and air pollution
transport.

* WHEN...Monday 2:30 PM until Thursday 8:00 PM. The highest ozone
levels typically occur in the afternoon and early-evening hours.

* IMPACTS...Ozone air pollution can cause serious health problems,
including trouble breathing, asthma attacks, and lung damage.
Everyone can be affected, but sensitive groups such as people with
lung disease, older adults, people who are pregnant, children, and
those who spend a lot of time outdoors are at greater risk.

To protect your health, check air quality levels and act as needed:

* When Air Quality Index (AQI) levels are "Unhealthy for Sensitive Groups"
(orange), sensitive groups as specified above should limit
extended or intense outdoor activity.
* When AQI is "Unhealthy" (red), everyone may experience health
impacts. Sensitive groups should avoid extended time outdoors.
* When AQI is "Very Unhealthy" (purple), sensitive groups should avoid
all outdoor physical activity. Everyone else should avoid
extended or intense outdoor activity.
* When AQI is "Hazardous" (maroon), everyone should avoid all
outdoor physical activity.

* ADDITIONAL DETAILS...

To help keep indoor air clean when air quality is poor:

* Keep windows and doors closed
* Run your air conditioner and/or an air purifier
* Do not use whole house fans or swamp coolers that bring in
outside
air if you have other methods to stay cool
* Avoid other sources of pollution such as fireplaces, candles,
incense, and grilling

To help minimize outdoor ozone air pollution levels:

* Limit the use of gasoline powered lawn and garden equipment until
evening hours
* Try to delay trips to the gas station and the use of household
chemicals until the evening

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.

For the latest air quality forecasts and information, visit the
website at aqmd.gov.