Background Knowledge of biological and climatic controls in terrestrial nitrogen (N) cycling
within and across ecosystems is central to understanding global patterns of key ecosystem …

Tropospheric ozone is a key air pollutant and greenhouse gas. Its fate strongly depends on
meteorological conditions and therefore subject to climate change influences. Such …

Short-lived climate forcers (SLCFs) affect climate and are, in most cases, also air pollutants.
They include aerosols (sulphate, nitrate, ammonium, carbonaceous aerosols, mineral dust …

Fine particulate matter (PM2. 5, particles with a mass median aerodynamic diameter of less
than 2.5 micrometers) in the atmosphere is associated with severe negative impacts on …

Abstract Fine particulate matter (PM2. 5) decreased by 30–40% across China during 2013–
2017 in response to the governmental Clean Air Action. However, surface ozone pollution …

Intensive agricultural activities in the North China Plain (NCP) lead to substantial emissions
of nitrogen oxides (NOx) from soil, while the role of this source on local severe ozone …

Atmospheric deposition of inorganic nitrogen is critical to the function of ecosystems and
elemental cycles. During the industrial period, humans have doubled the amount of …

Since its first confirmed case at the end of 2019, COVID-19 has become a global pandemic
in three months with more than 1.4 million confirmed cases worldwide, as of early April …

Severe surface ozone pollution over major Chinese cities has become an emerging air
quality concern, raising a new challenge for emission control measures in China. In this …

Changes in CO2 emissions during the COVID-19 pandemic have been estimated from
indicators on activities like transportation and electricity generation. Here, we instead use …