In an app on his phone, Cesar Rosales is able to track the air quality inside his San Ysidro home. It's connected to his air purifier and shows a significant improvement in the last few weeks.
Running has long been one of the most popular ways for people to stay fit. Some 50 million people run in the United States, the highest total in the world, meaning It's also become big business.
Wednesday is the Jewish New Year known as Rosh Hashana. San Diegans spend a day praying for family in Israel that just survived a missile attack by Iran.