What is the major focus/purpose of the Earth Day holiday? What are the environmental implications of tire fire? Is #2 consistent with #1?
Earth Day
Earth Day is a global holiday to show support for environmental protection. Tire fire is a large quantity of tires burning at once. Smoke from burning tires contain heavy metals and other harmful pollutants. Smoke is harmful to the environment. 
Annual event on 22 April
Do people celebrate Earth Day with a ceremonial tire fire?