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2021 CORPORATE RESPONSIBILITY REPORT I 65 Environmental s ustainability drives operational excellence (continued) Table 2: Scope 1 GHG Emissions Disaggregated (Metric Tons CO2-e) Measure 2021 Mobile Fuels 70,385 Facility Fuels 17,735 Refrigerants a 137,329 Process Emissions 6,974 Dry Ice 6,487 Total Scope 1 Emissions (Metric Tons CO2-e) 238,910 a Refrigerants were calculated for the largest facilities, primarily labs, using the GHG Protocol’s basic and advanced screening method. The screen covered 22% of Quest’s total footprint by square footage, and 38% of Quest’s lab square footage. Remaining refrigerant data were estimated based on the results of this screen. Emissions were based on IPCC, 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories (2019), Volume 3: Industrial Processes and Product Use, Table 7.9. Table 3: Scope 2 GHG Emissions Disaggregated (Metric Tons CO2-e) 2021 Measure Location-based Market-based Purchased Electricity 103,421 105,129 Steam & Chilled Water 2,819 2,819 Total Scope 2 Emissions (Metric Tons CO2-e) 106,240 107,948 Table 4: Scope 3 GHG Emissions Disaggregated (Metric Tons CO2-e) Measure 2021 Purchased Goods & Services 21,217,938 Fuel & Energy Related Activities 61,424 Upstream Transportation & Distribution 3,393,762 Waste Generated in Operations 18,224 Business Travel 9,726 Employee Commuting 126,082 Total Scope 3 Emissions (Metric Tons CO2-e) 24,827,156 To date, our efforts to reduce our GHG emissions have included energy efficiency measures at our facilities, such as laboratory testing platform consolidations, LED lighting retrofits, purchase of green power, and route optimization, including the following key accomplishments in 2021: • Completed the consolidation of the majority of our East Region lab operations into our Clifton, NJ lab • LED lighting retrofits which we believe will reduce our overall electricity consumption by 59% in our Marlborough cytology lab • Reduction of 1.2M miles in driving through route optimization projects for our fleet, which we believe will result in reduction of 424 metric tons of CO2 emissions • Quest continues to qualify for the EPA’s Green Power Partnership by exceeding 7% renewable energy use. Fleet conservation is another key aspect of our efforts to reduce GHG emissions, which we estimate resulted in a reduction of 1.8 billion pounds of CO2 and the elimination of more than 1,100 surplus vehicles in the last 15 years. Electric vehicles We are considering electric vehicles for our fleet. In 2021, we began the development of an electric vehicle pilot project. At our lab in Clifton, NJ, we installed charging stations in the public area of the garage. We are building out charging infrastructure at out Marlborough, MA lab and plan to begin infrastructure design and construction at remaining pilot locations. A Gold Rating in India Our office facilities in India achieved a Gold Rating from the India Green Building Council, which encourages green concepts and techniques to address national priorities in India. The rating considers site and facility management, water efficiency, energy efficiency, health and comfort, and innovation. TABLE OF CONTENTS 2021 OVERVIEW COVID-19 RESPONSE PROMOTING A HEALTHIER WORLD CREATING AN INSPIRING WORKPLACE BUILDING VALUE REFERENCES

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