Analysis of near-surface measurements at several measuring points in Graz, Austria, reveals the impact of restrictive measures during the COVID-19 pandemic on the emission of atmospheric pollutants. We quantify the effects at traffic hotspots, industrial and residential areas. Using historical data collected over several years, we are able to account for meteorological and seasonal confounders. Our analysis is based on daily means as well as intraday pollution level curves. Nitrogen dioxide (NO₂) has decreased drastically while the levels of particulate matter PM₁₀ and carbon monoxide (CO) mostly exhibit little change. Traffic data shows that the decrease in traffic frequency is parallel to the decline in the levels of NO₂ and NO.

对奥地利格拉茨几个测量点的近地表测量进行的分析表明，在COVID-19大流行期间采取限制性措施对大气污染物排放的影响。我们量化交通热点，工业和居民区的影响。使用过去几年收集的历史数据，我们能够说明气象和季节性混杂因素。我们的分析是基于日均值以及日内污染水平曲线。二氧化氮（NO ₂）急剧减少，而颗粒物PM ₁₀和一氧化碳（CO）的含量几乎没有变化。交通数据显示，交通频率的下降与NO ₂和NO含量的下降平行。