The first and most obvious effects of acid deposition were observed in freshwater ecosystems. Tens of thousands of lakes and streams in North America and Europe are more acidic than they were a few decades ago as a result of acid SULFUR DIOXIDE AND ACID RAIN 73 C04 08/23/2011 12: 74 deposition. These freshwaters are in sensitive areas with hard bedrock, thin acid soils, and little acid-neutralizing capacity, and their acidification has resulted in losses of fish and other aquatic organisms. The evidence showing that strong mineral acidity has caused ecological changes has come from many sources, including (1) historical…
Author: Luis
Introduction We as travelers are changing the way we travel, and brands clearly are taking note of it. Checking off must-see lists & taking selfies is very passé, travelers are opting for the actual experiences that every city in the world has to offer. This right here is what Airbnb is all about. Airbnb urges you to actually live like a local when you visit your dream destination. Objectives To understand that there is a revolutionary change in the concepts over which the businesses are evolving. To study the new trend in market Understanding that customer needs are of paramount…
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…
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…
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…
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…