Introduction
Metro is an important means of transportation, which bears a very heavy task of public transport.
Especially in large cities, metro transport accounted for an important part of daily travel. As high density
passenger subway, subway station staff gets more and more. Subway platform air quality is poor. Air
pollution is serious impact on people's health. To solve this problem, a lot of work has been done before. In
the usual subway environment, the exclusion of air pollution, mainly through the subway ventilation and
air conditioning systems. Ventilation and air conditioning system, the introduction of fresh air from the
outside, inside the subway station through the air exchange within the subway platform, reducing air
pollution site. Therefore, good or bad ventilation and air conditioning system operation, determine the
subway air pollution level.