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are more frequent and can trap pollutants close to the ground. In terms of health, CO competes with oxygen, often replacing it in the blood, thus reducing the blood's ability to transport oxygen to vital organs. The results of excess CO exposure can be dizziness, fatigue, and impairment of central nervous system functions. Sulfur Oxides Sulfur Dioxide (S02) is a colorless, pungent gas formed primarily by the combustion of sulfur-containing fossil fuels. The main sources of S02 are coal and oil used in power plants and industries; as such, the highest levels of S02 are generally found near large industrial complexes. In recent years, S02 concentrations have been reduced by the increasingly stringent controls placed on stationary source emissions of S02 and limits placed on the sulfur content of fuels. S02 is an irritant gas that attacks the throat and lungs and can cause acute respiratory symptoms and diminished ventilator function in children. S02 can also yellow plant leaves and erode iron and steel. Particulate Matter Particulate matter (PM) pollution consists of very small liquid and solid particles floating in the air, which can include smoke, soot, dust, salts, acids, and metals. Particulate matter can form when gases emitted from industries and motor vehicles undergo chemical reactions in the atmosphere. PM2.5 and PM10 represent fractions of particulate matter. Fine particulate matter, or PM2.5, is roughly 1/28 the diameter of a human hair. PM2.5 results from fuel combustion (e.g., motor vehicles, power generation, and industrial facilities), residential fireplaces, and woodstoves. In addition, PM2.5 can be formed in the atmosphere from gases such as sulfur oxides (SOx), NOx, and VOCs. Inhalable or coarse particulate matter, or PM1o, is about one- seventh the thickness of a human hair. Major sources of PM10 include dust stirred up by vehicles traveling on roads; crushing or grinding operations; wood-burning stoves and fireplaces; dust from construction, landfills, and agriculture; wildfires and brush/waste burning; industrial sources; windblown dust from open lands; and atmospheric chemical and photochemical reactions. PM2.5 and PM10 pose a greater health risk than larger-size particles. When inhaled, these tiny particles can penetrate the human respiratory system's natural defenses and damage the respiratory tract. PM2.5 and PMio can increase the number and severity of asthma attacks, cause or aggravate bronchitis and other lung diseases, and reduce the body's ability to fight infections. Very small particles of substances such as lead, sulfates, and nitrates can cause lung damage directly or be absorbed into the bloodstream, causing damage elsewhere in the body. Additionally, these substances can transport absorbed gases, such as chlorides or ammonium, into the lungs, also causing injury. Whereas PMio tends to collect in the upper portion of the respiratory system, PM2.5 is so tiny that it can penetrate deeper into the lungs and damage lung tissues. Suspended particulates also damage and discolor surfaces on which they settle, as well as produce haze and reduce regional visibility. An STR Ban Will Increase Air Pollutant Emissions and Greenhouse Gas Emissions There are approximately 1,000 active Airbnb listings in Santa Ana. Elimination of these Airbnb rentals and other short-term rentals in Santa Ana and the corresponding increase in guests at Santa Ana hotels 3/14