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There are three key categories of air pollution that adversely affect the quality of the air you breathe: volatile organic compounds (VOC), particulate matter (PM2.5 and PM10) and carbon dioxide. VOCs are emitted gasses that can come from cleaners, off-gassing plastics, paint, solvents, fragrances, cooking food and, ironically, air fresheners. VOCs are most closely related to odors you can smell. High levels can irritate your breathing passages, cause headaches and may become cancer-causing over time. Air purifiers with activated charcoal components can help clean VOCs from the air.，更多细节参见超级权重
In just a few days, "the project has grown into a small volunteer team," he enthuses — with four humans on website and support, and five more managing the Discord server. "We’ve also tightened moderation systems and queues to make sure spammers don’t ruin the fun for everyone else," Maroju adds. Appropriately enough, that means users must click to confirm they're human.