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## Independent Assurance Report on the Syngenta Corporate Responsibility Reporting 

To the Head of Legal and Taxes, Syngenta AG, Basel (‘Syngenta’) 

We have performed assurance procedures to provide assurance on the following aspects of the 2011 Corporate Responsibility (CR) reporting of Syngenta. 

## Subject matter 

Data and information disclosed in the CR reporting of Syngenta and its consolidated subsidiaries, for the financial year ended December 31, 2011 and with the indicated level of assurance as follows: 

– The application of the Syngenta internal Health, Safety and Environment (HSE) and Corporate Community Investment (CCI) reporting guidelines to the CR reporting with a reasonable assurance; 

– The internal reporting system and procedures, including the control environment, to collect and aggregate CR data with a reasonable assurance; and 

– The CR Performance Summary disclosed on pages 54 to 57 of the Syngenta Annual Review 2011 with a limited assurance. 

Our assurance procedures do not cover the indicators on capital expenditure, employee wages and benefits, payments to suppliers, governments and providers of capital, and economic value retained presented in the CR Performance Summary on page 54 of the Annual Review 2011. 

## Criteria 

– The Syngenta internal HSE and CCI reporting guidelines; and 

– The defined procedures by which the CR data are gathered, collated and aggregated internally. 

## Responsibility and Methodology 

The accuracy and completeness of CR performance indicators are subject to inherent limitations given their nature and methods for determining, calculating and estimating such data. Our assurance report should therefore be read in connection with Syngenta’s internal guidelines, definitions and procedures on the reporting of its CR performance. 

The Board of Directors of Syngenta AG is responsible for both the subject matter and the criteria. Our responsibility is to provide a conclusion on the subject matter based on our assurance procedures in accordance with the International Standard on Assurance Engagements (ISAE) 3000. 

For the subject matter for which we provide limited assurance, the nature, timing and extent of procedures for gathering sufficient appropriate evidence are deliberately limited relative to a reasonable assurance engagement. 

## Main Assurance Procedures 

Our assurance procedures included the following work: 

– Evaluation of the application of group guidelines 

Reviewing the application of the Syngenta internal HSE and CCI reporting guidelines. 

– Site visits 

Visiting the regional office of Syngenta in São Paulo as well as a Crop Protection site and a Seeds site in Brazil. The selection was based on quantitative and qualitative criteria. Interviewing personnel responsible for internal reporting and data collection at the sites we visited and at the Group level. 

– Assessment of the performance indicators 

Performing tests on a sample basis of evidence supporting the CR Performance Summary relative to completeness, accuracy, adequacy and consistency. 

– Review of the documentation 

Reviewing the relevant documentation on a sample basis, including, management and reporting structures and documentation. 

– Assessment of the processes and data consolidation 

Reviewing the appropriateness of the management and reporting processes for CR reporting. 

Assessing the consolidation process of data at the group level. 

## Conclusions 

In our opinion 

– The internal HSE and CCI guidelines are being applied properly; and 

– The internal reporting systems to collect and aggregate CR data are functioning as designed and provide an appropriate basis for its disclosure. 

Based on our work described in this report, nothing has come to our attention that causes us to believe that the data and information mentioned in the subject matter and disclosed with the CR reporting in the Syngenta Annual Review 2011 does not give a fair picture of Syngenta’s performance in the area of CR. 

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PricewaterhouseCoopers AG 

Basel, February 21, 2012 

Gerd Tritschler David Pritchett 

