There is a surprising fact about the air in big cities.  People often think that the chemicals that create smog come mostly from nature.  But recent studies show that a lot of these chemicals are actually made by humans.  These chemicals are called monoterpenes.  They are found in high amounts in cities, even more than in forests.  This is a big deal because it means that the air quality in cities might be worse than we thought.

Monoterpenes are not just from trees anymore.  They come from many things we use every day.  Things like cleaning products, paints, and even some cosmetics release these chemicals into the air.  In a place like Beijing, these man-made monoterpenes are almost twice as much as the natural ones.  This is a big problem because these chemicals help create ozone, which is bad for our health.

Scientists have found a way to measure these man-made monoterpenes.  They used a special model to show how these chemicals affect the air.  The results were surprising.  When they added these man-made chemicals to their model, it matched what was actually happening in the city much better.  This means that these chemicals are a big part of the problem.

The study also showed that these man-made monoterpenes make ozone levels go up.  In the summer, they can increase ozone levels by a lot.  This is a big problem because ozone is bad for our lungs and can make it hard to breathe.  The study suggests that we need to do something about this.  We need to find ways to reduce these chemicals in the air.

One of the biggest sources of these chemicals is household products.  Things like cleaning supplies and paints release a lot of these chemicals into the air.  If we can find ways to reduce these chemicals in our homes, we can make a big difference in the air quality of our cities.  This is not just a problem for scientists.  It is a problem for all of us.  We need to think about the chemicals we use every day and how they affect the air we breathe.

Urban Smog: The Hidden Role of Man-Made Chemicals

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