How is dust and air pollution related to construction being mitigated?
The Purple Line takes a mitigation approach to emissions that begins at the source and will only purchase, rent, or utilize off-road equipment that meets the various emissions requirements established by Maryland law. By only utilizing compliant equipment, the project is operating within the requirements. In addition, idling of delivery, dump trucks, and other diesel-powered equipment is limited to three minutes. Dust is monitored by environmental personnel who are certified in EPA Method 9 for visible opacity. This process evaluates any dust clouds generated inside and outside the jobsite. Project requirements dictate that dust opacity cannot exceed 15% at the project boundary.