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Langan provides expert land development engineering and environmental consulting services for major developers, renewable energy producers, energy companies, corporations, healthcare systems, colleges/universities, and large infrastructure programs throughout the U.S. and around the world. Our employees collaborate seamlessly among 50+ offices and gain valuable hands-on experience that fosters career growth. Langan culture is entrepreneurial from advancing innovative technical solutions, to participating in robust training and knowledge sharing, to making progressive change within the communities we live and work.
Consistently ranked among the top ten "Best Firms to Work For" and Engineering News-Record's top 50 firms worldwide, Langan attracts and retains the best talent in the industry. Employees thrive at Langan, a firm that fosters an inclusive and supportive work environment for all; prioritizes wellbeing, health, and safety; encourages volunteerism and philanthropy; offers workplace flexibility, along with carbon-neutral office spaces; and empowers individuals to contribute their skills and knowledge to make impactful contributions.
Job Summary
Langan is seeking an experienced Senior Noise & Air Quality Specialist to support CEQA-focused environmental planning efforts across California. This is a part-time on-call role designed for a highly experienced technical specialist who can provide targeted support on an as-needed basis for land development, transportation, and infrastructure projects.
In this capacity, you will act as a senior technical advisor and contributor, partnering closely with CEQA subject matter experts, environmental planners, and project managers to deliver technically sound, defensible environmental analyses and documentation.
Job Responsibilities

• Serve as a senior technical resource for noise, vibration, air quality, and greenhouse gas (GHG) analyses across CEQA-driven projects;
• Prepare and/or review technical studies and CEQA documentation (e.g., EIRs, IS/MNDs, technical appendices) related to noise and air quality;
• Develop and validate noise modeling and impact assessments for construction, operational, and transportation-related sources, including recommended mitigation measures;
• Support project scoping and strategy, including identification of appropriate methodologies, thresholds, and regulatory considerations;
• Provide peer review, QA/QC, and advisory input on technical analyses, modeling approaches, and impact conclusions;
• Conduct or oversee air quality and GHG emissions modeling and documentation in support of CEQA compliance;
• Collaborate with internal teams to integrate technical findings into comprehensive environmental documents and compliance strategies;
• Support responses to agency comments, public review feedback, and legal defensibility considerations;
• Engage in client coordination and multidisciplinary collaboration as needed to support project delivery; and
• Contribute expertise toward refining internal training, best practices, methodologies, and technical guidance for noise and air quality analyses.

Qualifications

• 12+ years of experience preparing and reviewing noise/vibration, air quality, and GHG analyses for CEQA projects (NEPA experience a plus);
• Demonstrated ability to independently produce or review defensible CEQA technical documentation;
• Strong working knowledge of California regulatory requirements, agency guidance, and accepted methodologies for noise, air quality, and GHG;
• Experience conducting ambient noise field measurements using ANSI Type I sound level meters;
• Familiarity with 23 CFR Part 772 and the Caltrans Traffic Noise Analysis Protocol;
• Proficiency with industry-standard tools such as FHWA TNM, RCNM, CadnaA, SoundPLAN, or similar;
• Proficiency with CalEEMod, EMFAC, and AERMOD for air emissions modeling;
• Experience supporting or preparing Health Risk Assessments (HRAs);
• Experience coordinating with regulatory agencies such as BAAQMD, SCAQMD, EPA, CARB, and local jurisdictions; and
• Excellent technical writing and communication skills with the ability to provide clear, concise, and defensible analyses.

Langan provides a rich array of programs and benefits to help its employees advance their careers and enhance the quality of their lives. Our comprehensive compensation package includes: full-time employment company paid medical, dental, and vision coverage; life insurance, short- and long-term disability insurance, and paid pregnancy disability leave; 401(k)/Roth with company match; paid time off including parental and military leave; employee referral and professional license bonuses; and educational reimbursement.
Langan offers employee resource groups; flexible work schedules; extensive training; wellness programs; buddy and mentoring programs; and much more!
Langan is committed to providing equal employment opportunities to all qualified applicants and employees, including individuals with disabilities and protected veterans. We believe that an inclusive workplace is essential for the well-being and success of our employees.
Certain US jurisdictions require Langan to include an estimate of salary or hourly ranges. The estimated range for this role is: $54-82 / hour. Actual compensation may vary based on factors such as related work experience, location, market conditions, education/training, certifications and other credentials, as well as applicable knowledge and skills. Certain roles may be eligible for overtime and participation in the firm's annual bonus and performance review program. Bonuses are discretionary and based on individual job performance and the profitability of the firm. Employees are also eligible to receive up to 20 days of paid vacation time, 10 days of paid sick time and 10 paid holidays throughout the year. Eligibility and actual paid time off may vary based on local law and factors such as hours worked, related work experience and level.