How Are Emissions Statistics Calculated?

Pollutant emissions refer to the amount of a certain pollutant discharged into the environment or other facilities by a pollution source. The amount of a certain pollutant discharged into the environment or other facilities by a pollution source. For designated pollutants, the amount of pollutants discharged shall be the difference between the amount of pollutants generated and the amount of pollutants reduced. It is one of the indicators for pollution source pollution control management in the total volume control or pollution permit.

quantity of pollutant discharged

For specified pollutants, the amount of pollutant emissions should be

I. Calculation of "Three Wastes" and Pollutant Discharges

There are many calculation methods for the "three wastes" and pollutant emissions. Except the actual measurement method (the actual measurement and its calculation method)

(I will not introduce it here), there are two main types: one is the material balance algorithm; the other is the empirical calculation method.

The Ministry of Environmental Protection recently released the "2013 Annual Report on Motor Vehicle Pollution Prevention and Control in China", which announced the state of motor vehicle pollution emissions in 2012. The "Research Achievements" column in this issue is serialized in six articles. This article contains the contents of the current state of motor vehicle pollutant emissions and their changing trends in 2012 for readers. The annual report pointed out that in 2012, the national motor vehicle emissions of 46.121 million tons, an increase of 0.1% over 2011, of which 6.04 million tons of nitrogen oxides (NOx), 4.382 million tons of hydrocarbons (HC), and carbon monoxide (CO) 3471.7 10,000 tons, particulate matter (PM) 622,000 tons. Cars are the main contributors to total pollutants, with emissions of more than 90% of NOx and PM, and more than 70% of HC and CO. Classified by vehicle type, the NOx and PM emissions of trucks nationwide are significantly higher than those of passenger cars, of which heavy trucks are the main contributors; while the emissions of CO and HC from passenger cars are significantly higher than those of trucks. According to fuel classification, the NOx emissions from diesel vehicles in the country are close to 70% of the total vehicle emissions, and PM exceeds 90%; while the CO and HC emissions of gasoline vehicles are higher, exceeding 70% of the total emissions. Classified according to emission standards, four major pollutants emitted by pre-National Standard I vehicles that accounted for 7.8% of vehicle ownership accounted for more than 35.0% of total emissions; while national III and above standard vehicles accounted for 61.6% of total vehicle ownership, their Emissions are less than 30.0% of total emissions. Classified according to environmental protection signs, "yellow label cars", which only account for 13.4% of car ownership, emit 58.2% of NOx, 56.8% of HC, 52.5% of CO, and 81.9% of PM. In 2012, the national vehicle ownership increased by 7.8% compared to 2011, but the total emissions of the four pollutants were basically the same as in 2011, which is in line with the implementation of stricter vehicle emission standards and the rapid elimination of high-yielding "yellow-label vehicles." "Related measures to improve the quality of vehicle fuel. ^[1]

The amount of major pollutants discharged by industrial enterprises into the environment is one of the indicators for environmental protection assessment. The purpose of evaluating this indicator is to require industrial enterprises to reduce the amount of pollutants discharged year by year in order to reduce or eliminate the harm to the environment.

There are 12 major pollutants listed as national assessments. Among them, there are three kinds of waste gas: sulfur dioxide, soot and industrial dust; the waste water includes chemical oxygen consumption, cyanide, petroleum, mercury, chromium (calculated as hexavalent chromium), arsenic, lead, cadmium, and solid waste. Various departments and regions can evaluate the pollutant projects of each enterprise by selecting several major pollutants with large emissions or serious hazards for assessment according to the company's pollutant discharge situation and local environmental conditions, and can increase pollutants. kind of. The pollutant discharge index is a major system that controls the total amount of emissions, quantifies, standardizes and scientifically manages the total amount of pollution sources in the enterprise and strengthens environmental management. After conducting pilot work on total amount control of certain major pollutants in some industries in some major cities in China. In 1996, it was decided to implement a total amount of pollutants control and conduct a formal assessment nationwide, which is of great strategic significance for China's environmental quality improvement and environmental management. ^[2]