How did early turbojet aircraft make airport noise a major problem near cities?

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By the early 1960s, noise pollution near urban airports became a significant issue due to two primary factors: a rapid increase in the frequency of flights and the introduction of first-generation turbojet aircraft, such as early Boeing 707 models and the Douglas DC-8.1

These early turbojets were particularly problematic because they possessed low climb performance, meaning they remained at lower altitudes for longer periods while operating near populated areas. This combination of increased air traffic and the loud, low-climbing nature of these jets led to widespread public opposition to airport expansions and eventually necessitated the implementation of strict noise curfews and international regulations to mandate quieter engine technologies.1