Author: Luis

Value Proposition & Customer Airbnb is a community-based, two-sided online platform that facilitates the process of booking private living spaces for travelers. On the one side it enables owners to list their space and earn rental money. On the other side it provides travelers easy access to renting private homes. With over 1,500,000 listings in 34,000 cities and 190 countries, its wide coverage enables travelers to rent private homes all over the world. Personal profiles as well as a rating and reviewing system provide information about the host and what is on offer. Vice versa, hosts can choose on their…

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While the CAA authorizes the EPA to set NAAQS, the states are responsible for establishing procedures to attain and maintain the standards. The states adopt plans known as State Implementation Plans (SIPs) and submit them to the EPA to ensure that they meet statutory requirements. SIPs are based on emission inventories and computer models to determine whether air quality violations will occur. States must develop monitoring plans for air pollution levels; these may be funded by the EPA. If the SIP shows that standards may be exceeded, the state may be required to impose additional controls on existing sources. Proposed…

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Observational studies of the influence of O3 on human health are often difficult to interpret because the population is also exposed to other pollutants in the ambient air that could affect the responses observed, or to other environmental challenges that may produce comparable effects, such as environmental tobacco smoke, other pollutants in indoor air, and allergens found in indoor and outdoor air. Grades 1 and 2 schoolchildren in Austria were studied across the summer for three successive years, and an O3 effect was detected on reducing FEV1 or lung growth.37 In the Children’s Health Study from Southern California, a new…

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There are two primary U.S. NAAQS (National Ambient Air Quality Standards) for SO2. The short-term (24-hour) standard is set at 0.14 ppm (0.365 mg/m3 ) and is not to be exceeded more than once per year per air pollution control district. The long-term standard specifies an annual arithmetic mean not to exceed 0.03 ppm (0.080 mg/m3 ). These standards do not address very shortterm exposures to SO2. It is well established that even brief exposures to SO2 during exercise, such as 15 or 20 minutes, can cause significant lung function impairment in people with asthma. Find out the latest news…

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