to walk to and from school with distances up to three miles one way. For these students, air quality is a concern, as is heat. Temperatures at the beginning of the school year have been known to exceed 100 degrees Fahrenheit. It is suggested that students susceptible to health conditions related to heat and/or air-quality receive transportation to school. School buildings To reduce construction costs, most schools are being built to standard designs. These designs are adapted to the various sites to deal with different topographies and site sizes. While most elementary schools are single story buildings, the district has built some demonstration schools using two story plans so that smaller sites could be used allowing schools to be located in built up areas that do not have space for a traditional single story design. New school buildings after 2016 are using the two story designs. Many middle schools built during the 1960s and 1980s were built in circular designs. An example of this design is the one story, 9-month middle school, B. Mahlon Brown Junior High School in Henderson. These schools are usually with one directional hallways with several different "wings" with each hosting different subjects (i.e., 100's Language Arts, 200's Mathematics, 300's Science). During the 2010-2011 school, all schools converted to a 9-month school year due to budget shortfalls. Two campuses were converted back to year-round schedules beginning in the 2013–2014 school year. For the 2014–2015, 10 additional elementary school campuses were converted to the year-round schedule. This conversion was due entirely to overcrowding in these school buildings. The district also adds portable classrooms, which are modular buildings, at many schools to provide additional space for classes. The district had contracted with Edison Schools to operate several schools in an effort to improvement performance at those selected schools. The contract was terminated at the end of the 2013–2014 school year. School police See also The Clark County School District Archive Committee documents the history of the CCSD. List of the largest school districts in the United States by enrollment KLVX Communications Group owned by the school district; which operates KLVX (PBS member station known on-air as "Vegas PBS") References External links School districts in Nevada Education in Clark County, Nevada School districts established in 1956