How do scientists obtain the number of deaths due to air pollution? what is an issue with such estimates? (an exact answer is not required but a logical one is preferred.)

Answer and Explanation:

The researchers are acquiring the deaths because of the air contamination. It includes lung malignant growth heart stroke, pneumonia, respiratory issues, coronary illness and so forth.

The deaths are caused as a result of surrounding air contamination, air contamination from the households.

The air quality is estimated by the air quality record, that ranges zero to 500 degree. It demonstrates the difference in contamination measure of air.  

The issue is despite the fact that air contamination is the reason for death yet it's a circuitous proof.

no sé si entiendes español pero te daría la respuesta si lo supiera, pero lo siento mucho