The contents of this study include to consolidation of ambient monitoring measures for hazardous air pollutants and environmental monitoring methods for 29 hazardous air pollutants, photochemical assessment monitoring stations and field sampling data were analyzed the concentration characteristics of hazardous air pollutants in Taiwan and planning the location of environmental monitoring stations for hazardous air pollutants. It mainly collects the US Environmental Protection Agency's program specifications classified as air toxicants, which can be divided into National Air Toxic Trends Stations (NATTs), Urban Air Toxic Monitoring Program (UATMP), and Community Scale Air Toxics Ambient Monitoring (CSATAM).To collect different monitoring objectives, monitoring projects, monitoring station locations of HAPs ambient monitoring at other countries, including from the US Environmental Protection Agency (USEPA), European Air Pollutant Long-Range Transmission Monitoring and European Monitoring and Evaluation Programme (EMEP) and other countries as a reference for the planning of Taiwan's monitoring network. This study summarizes the monitoring methods for numbers of HAPs. The methods covers sampling and analysis methods for volatile organic compounds, mercury and other heavy metals. The median concentrations of benzene, toluene, ethylbenzene and xylene in the photochemical assessment monitoring stations have been declining year by year. In addition to the Siaogang, each station has the lowest value in 2018. Based on the data measured in special industrial zones from 2016 to 2018, the median concentratons of species monitored automatically showed a trend of decreasing year by year. In Kaohsiung, five fields were continuously sampled on-site at least seven days. The concentration characteristics of Taiwan's HAPs were analyzed and the comparison of VOCs and heavy metal samples was performed. The VOCs were sampled using the MiTAP automatic instrument and the stainless steel canisters manual method. The heavy metal automatic monitoring was performed by Xact 625i and the manual sampling used an open-face sampler. Formaldehyde and acetaldehyde used LpDNPH-Cartridge for chemical adsorption to collect samples; asbestos used three-piece filter paper, and PCBs used PUF high-sampler. The data showed that the highest average daily concentration of VOCs in each station was toluene and m,p-xylene, and the highest average daily concentration of heavy metals in each station was the lead. The project currently used PM and HC emissions data in TEDS10 from various sources to screen out the top 90% of the emission, and the Speciate-4.5 database to screen out the industry codes, vehicle codes and the source code separately found the corresponding fingerprint data for subsequent emission estimation. The estimated emissions of various industries divided into counties and cities, and used Industrial Source Complex (ISC) doing model simulation. Due to the large number of species, the annual average incremental concentration distribution is different. Therefore, the incremental concentration is converted into the cancer risk value in the health risk assessment, and the species are aggregated into the total cancer risk value, which is used to analyze the optimal position of the environmental monitoring station for hazardous air pollutants.

Hazardous Air Pollutants, Environmental Monitoring, Air Monitoring Network