Formed in 1995, LEHDER Environmental Services is now one of the largest Air Quality Management companies in Canada.  At LEHDER we recognize our client's need to make decisions that provide for operational flexibility while meeting regulatory, economic, and social requirements.

Current Positions

Air Dispersion Modeller - Intermediate/Senior

The LEHDER team consists of over 40 talented technologists, scientists, engineers, and project managers. We are looking for an intermediate or senior level air dispersion modeller with a minimum of 3 years of air quality experience to join our team in Sarnia.

Job Description

The successful candidate will be joining our Industrial Services Group.  Project work will include conducting dispersion modelling for permitting, solution development, and incidents.  The position will allow you to apply your comprehensive understanding of air dispersion modelling and metorological concepts.  You will be responsible for developing and managing dispersion models for large, complex industrial facilities and performing analysis to aid in solution development.  Your experience with regulatory modelling in Ontario with AERMOD and CALPUFF will enable you to provide support to our core group of air dispersion modellers and mentor junior team members.


  • Degree or Diploma in Environmental Science, Chemistry, Atmospheric Science, Engineering, Environmental Technology or related field
  • 3+ years of experience in advanced air dispersion modelling
  • Dispersion modelling skills using AERMOD and AERMET
  • Dispersion modelling skills using CALPUFF and CALMET
  • Demonstrated expertise in Excel with emphasis on data analysis, calculation development using a variety of functions, and QA/QC strategies
  • Experience in interpreting and applying regulatory requirements
  • Strong skills related to technical writing and oral and written communication

Working at LEHDER

LEHDER’s Head Office is located in Sarnia-Lambton, the perfect place to live, work and play. Home to just over 128,000 residents in southwestern Ontario, Sarnia-Lambton offers the water enthusiast many opportunities including world class yachting, a thriving fishing industry, and beautiful sandy beaches which are characteristic of the area. Even land lovers will appreciate the Blue Water Experience with our spacious parks, variety of festivals, 20 public golf courses and an incredible array of special events throughout the year (

LEHDER's Western Division is based in Edmonton, Alberta. Our Western Canada office is located in Edmonton, Alberta; a vibrant place to be. Edmonton’s grassroots culture, down-to-earth people and community-driven values make it a great place to live. Edmonton is home to the largest stretch of urban parkland in North America. It truly is a unique place with something for everyone - you can play outdoors, experience a vast array of professional sporting events or enjoy Edmonton’s world-class shopping and dining, vivacious nightlife and theatrical culture and the more than 30 festivals and events that take place there each year.

LEHDER's corporate culture fosters an environment of integrity, respect and enthusiasm. We offer a flexible work schedule that recognizes a healthy work/life balance and employees have direct access to mentorship. LEHDER offers a full suite of benefits, including Group RRSP plans, medical and dental insurance, Employee Assistance Program, fitness expense reimbursement, and overtime pay.

LEHDER is committed to providing accessible employment practices that are in compliance with the Accessibility for Ontarians with Disabilities Act (AODA). Applicants requiring accommodation for disability during any stage of the recruitment process are encouraged to advise accordingly.

Ways to Apply

  • Email your resume and cover letter to:
  • Complete the online application form below. Please clearly indicate the position for which you are applying.

Applications will be accepted until August 9, 2019

We thank all applicants however, only those selected for an interview will be contacted.

LEHDER Environmental Services Limited
Suite 210, 704 Mara Street
Point Edward, Ontario
N7V 1X4


Please use the following form for resume submissions:

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If you have any questions or are having trouble submitting your resume, please contact us.