France issued a decree to restrict and prohibit mainly outdoor lighting effective from January 1st, 2019. Effectiveness of this legislation has been evaluated in this study using GIS data which was first used in \cite{2020MNRAS.493.1204A} (so called astroGIS database - \url{this http URL}). A subset of Artificial Light layer of astroGIS database has been adapted for years between January 2012 and December 2019. During 2019, radiance of $1.9 \times 10^{9}$ W cm$^{-2}$ sr$^{-1}$ has been released into space. Annual light pollution in France decreased by 6\% after the enactment of artificial light legislation. France continue to have potential Dark Sky Park locations for example cities like Indre, Lot, Nievre and Creuse having the lowest light pollution values. A strong correlation between population and light pollution ($R\simeq 0.83$) has been observed. A similar but a weak correlation can also be observed for GDP ($R\simeq 0.28$). However, it is still too early to justify whether the improvements observed in the dataset are due to the enactment of the legislation or not.

中文翻译：

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法国光污染案例研究

法国颁布了一项法令，从 2019 年 1 月 1 日起生效，主要限制和禁止户外照明。本研究使用 GIS 数据评估了该立法的有效性，该数据首先用于 \cite{2020MNRAS.493.1204A}（所谓的 astroGIS 数据库 - \url{这个 http URL}）。2012 年 1 月至 2019 年 12 月期间，astroGIS 数据库人造光层的一个子集已进行了多年调整。2019 年期间，辐射亮度为 $1.9 \times 10^{9}$ W cm$^{-2}$ sr$^{-1 }$ 已被释放到太空中。人造光立法颁布后，法国每年的光污染减少了 6%。法国继续拥有潜在的暗夜公园地点，例如像 Indre、Lot、Nievre 和 Creuse 这样光污染值最低的城市。人口与光污染之间的强相关性 ($R\simeq 0. 83$) 已被观察到。对于 GDP ($R\simeq 0.28$)，也可以观察到类似但较弱的相关性。然而，现在判断数据集中观察到的改进是否是由于立法的颁布还为时过早。