Some but a lot less than you might think. The US invests a lot in global sensing, in some cases operating redundant independent networks while many countries don’t even have domestic sensing. This is a consistent complaint of non-US scientists that work with sensing data; it is difficult to get their governments to invest in domestic sensor networks when the US kind of does it for you, so even many developed countries have limited domestic data. In Europe in particular, there are additional privacy concerns that stymie more creative approaches at aggregating these types of measurements by other means.

When one of these countries does build out a domestic sensor network, they are often unwilling to share the data because it is seen as advantaging the Americans. Resistance to data sharing is quite high, for many reasons, so if you need to do anything that spans many countries you often end up falling back on whatever the Americans can give you.

The geopolitics around data sharing has been a significant hindrance to scientific activities like trying to build accurate and detailed climate and environmental models. Natural processes don’t recognize national borders.

The only global sensor networks operated by several countries independently are related to weather, and even then there are fewer than people probably imagine.