पृथ्वी के वायुमंडल में हाइड्रॉक्सिल मूलक (OH) की अधिकतम सांद्रता निम्नलिखित में से किस स्थान पर देखी जाती है?

Which of the following statements about oxidation chemistry in the atmosphere are correct? A. OH• is produced from the photolysis of O3 followed by the reaction of O(1D) with water vapor. B. CH4 reacts very rapidly with OH•, which makes its atmospheric lifetime very short. C. NO3• is generated by the reaction between O3 and NO2. D. HO2 is converted back (regenerated) into OH• by reaction with NO.

Peroxyacyl nitrates (PANs) are important in atmospheric chemistry because they: