Smog is a type of air pollution that is caused by a combination of smoke and fog. It occurs when emissions from vehicles, factories, power plants, and other sources react with sunlight and moisture in the atmosphere, forming a mixture of pollutants that includes ground-level ozone, particulate matter, and other chemicals.

Smog can have a variety of negative effects on both the environment and human health. Here are some of the most common impacts of smog:

1. Respiratory problems: Smog can cause respiratory problems such as coughing, wheezing, and shortness of breath. It can also aggravate asthma and other lung conditions, making it harder for people to breathe.

2. Cardiovascular problems: Smog has been linked to an increased risk of heart attacks, strokes, and other cardiovascular problems. This is because the particles in smog can get into the bloodstream and cause inflammation, leading to damage to the cardiovascular system.

3. Environmental damage: Smog can harm plants, trees, and crops by damaging their leaves, reducing their growth, and making them more susceptible to disease. It can also contribute to acid rain and other forms of environmental damage.

4. Reduced visibility: Smog can reduce visibility, making it harder to see and navigate, especially in urban areas where there are many buildings and other structures.

5. Economic impacts: Smog can have economic impacts by reducing tourism and damaging crops, which can result in financial losses for businesses and individuals.

Overall, smog is a serious problem that has significant negative impacts on both human health and the environment. It is important to reduce emissions from sources such as vehicles and power plants to help mitigate the effects of smog and improve air quality.