Particulate pollutants are

The correct answer is D. Particulate pollutants are small solid particles and liquid droplets released into the atmosphere. They can be natural or man-made, and they can come from a variety of sources, including vehicles, power plants, and industrial processes. Particulate pollutants can cause a number of health problems, including respiratory problems, heart disease, and cancer.

Option A is incorrect because it only includes solid particles. Option B is incorrect because it only includes liquid droplets. Option C is incorrect because it only includes solid particles released into the atmosphere.