What are the potential effects associated with the criteria pollutants if elevated levels are present?
Carbon Monoxide (CO) results from the incomplete combustion of fuel. CO is an odorless, colorless gas that at elevated concentrations can cause headaches and nausea. Consequently, emissions of this gas from major sources (for example motor vehicles) are regulated by federal emission standards. Volatile Organic Compounds (VOCs) are organic chemicals that easily vaporize at room temperature. VOCs include a wide range of substances, such as hydrocarbons (for example benzene and toluene), halocarbons and oxygenates. The hydrocarbon VOCs are usually grouped into methane and other non-methane VOCs. Methane is an important component of VOCs, its environmental impact principally relates to its contribution to the production of ground level or lower atmosphere ozone. Typical sources of VOC s include incomplete fuel combustion, leakage of natural gas from distribution systems, and atmospheric chemical reactions. The evaporation of solvents can also result in releases of VOCs Oxides of Nitrogen (
