query: What is the air quality in Los Angeles?
passage: Pollution in California
Pollution in California relates to the degree of pollution in the air, water, and land of the state of California. Pollution is defined as the addition of any substance (solid, liquid, or gas) or any form of energy (such as heat, sound, or radioactivity) to the environment at a faster rate than it can be dispersed, diluted, decomposed, recycled, or stored in some harmless form.[1] The combination of three main factors are the cause of notable unhealthy levels of air pollution in California: the activities of over 39 million people, a mountainous terrain that traps pollution, and a warm climate that helps form ozone and other pollutants.[2] Eight of the ten cities in the US with the highest year-round concentration of particulate matter between 2013 and 2015 were in California, and seven out of the ten cities in the US with the worst ozone pollution were also in California.[3] Studies show that pollutants prevalent in California are linked to several health issues, including asthma, lung cancer, birth complications, and premature death.[4] In 2016, Bakersfield, California recorded the highest level of airborne pollutants of any city in the United States.[5]
passage: Climate of California
During the cooler winter months (October–March), the Coachella Valley regularly has the warmest winter temperatures out of any place west of the Rocky Mountains. East Los Angeles, the Gateway Cities, and parts of the San Gabriel Valley average the warmest winter high temps (72°F, 22°C) in all of the western U.S., and Santa Monica averages the warmest winter lows (52°F, 11°C) in all of the western U.S. Palm Springs, a city in the Coachella Valley, averages high/low/mean temperatures of 75°F/50°F/63°F, (24°C/10°C/17°C) respectively during the period of cooler weather from November to April.[5]