1. Explain the meaning of the integral 1:2 {ET}: tip. 2. When the EPA sets a standard for ne particulate matter being emitted into the atmosphere, the Agency species a diameter, p; then any emission must be ltered for particles of diameter greater than or equal to p. Write down an integral that represents the number of particles that the current standard of 10 pm would cause to be removed from the air. 3. Based on emerging scientic evidence that the smaller particles are dangerous because they lodge deep within the lungs, the EPA announced in the Spring of 1997 its intent to lower the regulatory standard from 10 pm to 2.5 pm. Write down an integral that represents the number of additional particles (per cm3) that would be removed if the standard were changed from 10 am to 2.5 ,urn