* WHAT...The South Coast AQMD has extended an air quality alert due to harmful levels of fine particle pollution. Visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels. * WHERE...in Vernon, Maywood, Bell Gardens, Westmont, Hawthorne, Inglewood, Downtown LA, East LA and Huntington Park. Levels of particle pollution can vary by time and location depending on emissions and local weather conditions. * WHEN...until 11:59 PM Thursday. * IMPACTS...Particle pollution can get deep into the lungs and cause serious health problems such as heart attacks, bronchitis, asthma attacks, and difficulty breathing. Everyone can be affected, but sensitive groups such as people with lung or heart disease, older adults, people who are pregnant, children, and those who spend a lot of time outdoors are at greater risk.