The Environmental tag covers optical components and systems specifically engineered to operate reliably in challenging outdoor and industrial environments. Articles associated with this tag emphasize rugged mechanical designs, sealed assemblies, and protective coatings that defend against dust, moisture, temperature extremes, and mechanical shock. These optics are often used in environmental monitoring, industrial inspection, security, and infrastructure applications where uptime and data quality are critical despite harsh conditions. Topics may include material and coating choices for UV, visible, and IR bands, strategies for preventing fogging or icing, and methods for maintaining calibration over long field deployments. For system designers and operations teams, this tag illustrates how proper optical design and packaging can significantly extend service intervals and improve measurement reliability in the field. It also showcases Avantier’s ability to tailor optics and assemblies to specific environmental requirements, from Arctic cold to desert heat.