Calf Muscles. 1  The calf muscles are six in number: the gastrocnemius, the soleus, the popliteus, the tibialis posterior, the flexor digitorum longus, and the flexor hallucis longus. 2  The gastrocnemius and the soleus run between the knee and the ankle. 3  One of the calf muscles, the soleus, has a special ability.
Ozone Pollution. Ground level or bad ozone is not emitted directly into the air, but is created by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOC) in the presence of sunlight.
Ozone, when it occurs. at ground level, presents. a serious air quality problem. in many parts of the United. States. When inhaledâ. even at very low levelsâ. ozone can cause a number. of respiratory health effects. In fact, breathing smoggy air can. be hazardous because smog contains. ozone, a pollutant that can harm our. health when there are elevated levels. in the air we breathe. This publication. will tell you what kinds of health. effects ozone can cause, when you.