Winter is a time when many New Hampshire residents use wood to heat their homes. Although wood is sometimes considered an environmentally friendly fuel for home heating, it can be a significant local source of particulate matter emissions, which can aggravate asthma and cause shortness of breath or difficulty breathing. There are important steps that the wood-burning public can take to reduce these emissions. Learn more with UNH Extension's Heating Your Home with Wood and EPA's Burn Wise resource pages.