Answer:
Certain types of Air pollution, Diseases
Step-by-step explanation:
Environmental factors
Carbon monoxide is produced when fuels such as gas, oil, coal and wood do not burn fully. The increase of factories and manufacturing stations globally increases the chances of one inhaling carbon monoxide. When inhaled the carbon monoxide binds the haemoglobin in the blood increasing the chances of heart failure and brain damage.
Health factors
Health conditions such as Obesity, Diabetes can contribute to poor blood flow in the body. If someone were to suffer from obesity they would consequently have fatty deposits in the lining arteries. These deposits shrink the space that blood can pass through arteries. This means the heart has to pump blood harder to achieve the same task as someone able bodied. This dangerous because the heart would be at more risk of failing under the strain of the excess mass.