Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Particulates cause lung diseases. They can also increase the risk of heart disease and the number of asthma attacks. Particulates block sunlight from reaching Earth's surface. This means there is less energy for photosynthesis. Less photosynthesis means that plants and phytoplankton produce less food. This affects whole ecosystems. Answer: asthma attacks
Particulates cause lung diseases. they can also increase the risk of heart disease and the number of what?