HJ/T 2.2-1993Technical guidelines for environmental impact assessment - Atmospheric environment (English PDF)

4.1 Work tasks

Through surveys, predictions, etc., the project will be arranged after the construction phase, production operation and service expiration (which can be selected according to the project).

The extent, and frequency of the effects of atmospheric pollutants on ambient air quality are analyzed, predicted and evaluated, and the site selection and selection of the project Emissions schemes, air pollution control facilities and preventive measures development, emissions accounting, and other related engineering design, project implementation environment Provide scientific evidence or guidance for monitoring, etc.

4.2 Working procedures

4.2.1 Phase 1. The main tasks include research related documents, project pollution source survey, environmental air protection target survey, evaluation factors Screening and evaluation criteria are determined, regional meteorological and surface feature surveys are collected, regional terrain parameters are collected, and evaluation grades and evaluation ranges are determined.

4.2.2 The second phase. The main work is carried out according to the evaluation level requirements, including the investigation and verification of pollution sources related to project evaluation.

Combined forecasting model, environmental quality status survey or supplementary monitoring, collecting basic data such as meteorological and surface parameters required to establish the model, and determining the pre-determination Test content and forecasting plan, and carry out atmospheric environmental impact prediction and evaluation work.

4.2.3 Phase III. The main tasks include the development of environmental monitoring plans, the conclusions and recommendations of atmospheric environmental impact assessment, and the completion of environmental impact.

The preparation of the evaluation document, etc.

4.2.4 The working procedures of atmospheric environmental impact assessment are shown in Figure 1. The basic contents and specifications of each working phase are shown in Appendix C.

Evaluation work begins Preliminary forecast (estimation mode) Evaluation level determination Pmax 10% Project pollution source survey Evaluation factor and evaluation Standard determination Further investigation of pollution sources (when necessary) Secondary or tertiary evaluation Determine the scope of evaluation Model basic data collect Primary evaluation Pollution source further survey Determine forecast content and program Atmospheric environmental impact prediction Environmental Impact Assessment Conclusions and Recommendations End of evaluation Select predictive model Atmospheric environmental impact assessment Improvements and suggestions Environmental quality Check or supplement monitoring Environmental quality status survey or supplement Charge monitoring (if necessary) Ambient air protection Target survey Regional meteorology and surface Feature survey Pmax 1% Secondary evaluation Three-level evaluation no Yes Environmental monitoring plan Collecting regional terrain parameter

Figure 1 Atmospheric environmental impact assessment work procedures

5.1 Environmental Impact Identification and Evaluation Factors Screening

5.1.1 Identify the atmospheric environmental impact factors according to the requirements of HJ 2.1 or HJ 130, and screen out the atmospheric environmental impact assessment factors. Atmospheric ring the environmental impact assessment factors are mainly the basic pollutants and other pollutants emitted by the project.

5.1.2 When the annual emissions of SO2 and NOx emitted by the construction project are greater than or equal to 500 t/a, the evaluation factor should increase the secondary PM2.5, see

Table 1.

5.1.3 When the annual emissions of SO2, NOx and VOCs emitted by the planned project reach the amount specified in Table 1, the evaluation factor should be increased by two.

PM2.5 and O3.

Table 1 Screening of secondary pollutant evaluation factors

Category Pollutant Emissions/(t/a) Secondary Contaminant Evaluation Factor Construction project SO2 NOx >= 500 PM2.5 Planning project SO2 NOx >= 500 PM2.5 NOx VOCs >=.2000 O3

5.2 Determination of evaluation criteria

5.2.1 Determine the environmental quality standards and corresponding pollutant discharge standards applicable to each evaluation factor. Among them, the environmental quality standard is selected.

Ambient air quality concentration limits in GB 3095, if existing local environmental quality standards, the concentration limits in the local standards should be used.

5.2.2 For the pollutants not included in GB 3095 and local environmental quality standards, refer to the concentration limits in Appendix D.

5.2.3 For pollutants not included in the above standards, please refer to the environmental quality concentration limits issued by other countries or international organizations.

The baseline value, but should be stated and implemented with the consent of the competent ecological environment authority.

5.3 Evaluation level judgment

5.3.1 Select the main pollutants and emission parameters for the normal discharge of the project pollution source, and use the estimation model in the recommended model of Appendix A.

Calculate the maximum environmental impact of the project's pollution source, and then grade it according to the evaluation work classification criteria.

5.3.2 Evaluation work classification method

5.3.2.1 According to the preliminary investigation results of the project pollution sources, calculate the maximum ground air quality concentration of the main pollutants discharged from the project.

Rate Pi (i-th pollutant, referred to as "maximum concentration ratio"), and the ground air mass concentration of the ith pollutant reaches the standard value the maximum distance D10 corresponding to 10%. Where Pi is defined in equation (1).

Where. Pi -- the maximum surface air mass concentration of the i-th pollutant, the percentage, %;

Ci -- maximum 1 h surface air mass concentration of the ith pollutant calculated using the estimation model, µg/m3;

C0i -- Ambient air quality concentration standard for the ith pollutant, µg/m3. Generally choose 1 h in GB 3095, the average quality is thick the secondary concentration limit of the degree. If the project is located in a type of ambient air functional zone, the corresponding primary concentration limit should be selected; it is not included in the standard.

For contaminants, use 5.2 to determine the average mass concentration limit for each evaluation factor of 1 h. For only 8 h average mass concentration limit, daily average the mass concentration limit or the annual average mass concentration limit can be converted into 1h average mass concentration limit by 2 times, 3 times and 6 times respectively.

5.3.2.2 Projects that prepare environmental impact reports When using the estimation model to calculate the evaluation level, the terrain parameters should be entered.

5.3.2.3 The evaluation level is divided according to the classification criteria in Table 2. The maximum ground air mass concentration rate Pi is calculated according to formula (1), such as the number of contaminants i is greater than 1, taking the largest Pmax of the P values.

Table 2 Evaluation Level Discrimination Table

Evaluation work rating evaluation work grading criterion Primary evaluation Pmax >= 10% Secondary evaluation 1% <= Pmax 6 Investigation and evaluation of current environmental air quality

6.1 Content and purpose of the survey

6.1.1 First-level evaluation project

6.1.1.1 Investigate the environmental quality compliance of the project area as the basis for judging whether the project area is the compliance area.

6.1.1.2 Environmental quality monitoring data with evaluation factors of environmental quality standards within the scope of investigation and evaluation or supplementary monitoring for evaluation the current state of environmental quality of pollutants in the project area, as well as the current environmental protection target and the environmental quality of the grid points.

6.1.2 Secondary evaluation project

6.1.2.1 Check the environmental quality of the project area.

6.1.2.2 Environmental quality monitoring data with evaluation factors of environmental quality standards within the scope of investigation and evaluation or supplementary monitoring for evaluation the current status of environmental quality of pollutants in the project area.

6.1.3 Three-level evaluation project

Only investigate the environmental quality of the project area.

6.2 Data source

6.2.1 Current environmental quality data of basic pollutants

6.2.1.1 The project area is judged by the target, and the evaluation base year environment publicly released by the national or local ecological environment authority is given priority.

Data or conclusions in quality announcements or environmental quality reports.

6.2.1.2 Use the monitoring data of the evaluation base year for one year in the national or local environmental air quality monitoring network within the evaluation scope, or adopt the current status of ambient air quality data publicly released by the competent department of ecological environment.

6.2.1.3 If there is no ambient air quality monitoring network data or publicly released ambient air quality status data within the scope of evaluation, the selector Ambient air quality city point or area point similar to HJ 664 and geographical proximity to the evaluation area, similar to topography and climatic conditions Monitoring data.

6.2.1.4 For environmental air protection targets or grid points located in the area of ambient air quality, the current environmental quality of each pollutant may be Take an ambient air quality area point or back that meets the requirements of HJ 664 and is geographically close to the evaluation area and has similar topography and climatic conditions.

Attraction monitoring data.

6.2.2 Current quality data of other pollutants

6.2.2.1 It is preferred to use the monitoring data of the national and local environmental air quality monitoring network within the evaluation scope for one consecutive year.

6.2.2.2 If there is no ambient air quality monitoring network data or publicly released ambient air quality status data within the scope of evaluation, it may be collected and evaluated.

Historical monitoring data related to other pollutants emitted by the project in the past three years within the price range.

6.2.3 In the absence of the above relevant monitoring data or monitoring data can not meet the evaluation requirements specified in 6.4, it should be supplemented according to the requirements of 6.3 monitor.

6.3 Supplementary monitoring

6.3.1 Monitoring period

6.3.1.1 According to the pollution characteristics of the monitoring factors, select the seasons with heavy pollution to monitor the status quo. Supplementary monitoring should be valid for at least 7 days data.

6.3.1.2 For some other pollutants that cannot be continuously monitored, the primary air quality concentration can be monitored, and the monitoring time should be used.

The time requirement for the evaluation criteria.

6.3.2 Monitoring points

The local dominant wind direction calculated in the past 20 years is the axial dir...