निम्नलिखित में से कौन सा वायु प्रदूषक मुख्य रूप से प्रकाश-रासायनिक धूमकोहरा (photochemical smog) के निर्माण में सहायता करता है?

Which among the following air pollutants is NOT included in India's National Air Quality Index (NAQI)?

Carbon dioxide is primarily classified as a greenhouse gas because it has the ability to trap which of the following?