Environmental Risk of Carbon Monoxide Pollutant in Tehran Outdoor Sports Spaces and Recreation Sites

The purpose of this study was to evaluate the environmental risk of Tehranchr('39')s sports spaces in terms of the release of carbon monoxide pollutants.

First, data related to carbon monoxide pollutants were collected from the Tehran Air Pollution Monitoring Center and analyzed from the beginning of April 2018 to the beginning of April 2019. Using Craigchr('39')s introspection, the corresponding raster was generated and classified. Finally, the classification was done and the relevant map was prepared using the air quality index table (AQI / PSI), the spatial location layer of the sports complex, and the pollution layer of the carbon monoxide was merged using  IO technique in the GIS. William Finechr('39')s risk assessment method, with two different scenarios, was used to determine the level and rank of environmental risk.

The results showed that the highest and the lowest hourly concentration of carbon monoxide pollutants are recorded in Aqdasiyeh (with 2.39 ppm) and Piroozi (with 2.11 ppm), respectively. The cleanest air was recorded in Aqdasiyeh station (with 77 clean days), while the most polluted air was recorded in Piroozi station (with just7 clean days). Approximately, 30 percent of the days of the year had grouped into categories of "unhealthy" and "unhealthy for sensitive groups". The average hourly and daily concentration of carbon monoxide pollutants was less than permitted levels at all stations, indicating that none of the sports complexes in the study area are at risk for hourly concentrations of carbon monoxide pollutants. According to Scenario A, the risk rating is related to the carbon monoxide pollutant 24, which indicates a non-hazardous situation and a "low-risk level".

About 12 sports complexes are directly exposed to this pollutant and it is necessary to adopt management strategies to improve the quality of this type of urban land use.