The correct answer is the second option. Particulate matter is the air pollutant known to affect people with asthma. It also can cause other illnesses like cough, chest discomfort and a burning sensation in the lungs.
B) hydrogen gas burns in air.
explanation: the rest are physical properties.
I believe it can be warm because usually the surface below us is warm itself, causing the air to be warm as well. The temperature can vary as well
Noble gases are the least<span> reactive </span>elements<span> in the periodic table because they have a full valence shell. Examples are, Argon, Neon, Xenon, and Helium</span>
