If you haven't seen it, you may have smelled it.

Smoke from the Palos Fire, a large warehouse fire burning in the Boyle Heights area of Los Angeles, drifted east Tuesday and affected air quality in communities across the San Gabriel Valley, including La Verne.

According to Los Angeles Fire Department spokesperson Lyndsey Lantz, shifting winds around 3 p.m. today increased the amount of smoke moving into surrounding areas.

Lantz said the smoke is normal as firefighters continue to battle the fire, noting that while the situation is expected, smoke exposure is never considered healthy.

Lantz advised residents to limit time outdoors, keep windows closed, run air conditioning instead of bringing outside air into their homes and use air purifiers if available. Residents with respiratory conditions, older adults and young children may want to take extra precautions until air quality improves.

In an update posted around 7 p.m., the Los Angeles Fire Department said residents near Boyle Heights may notice increased amounts of black and white smoke coming from the building. Fire officials said the change was expected as crews became more aggressive with firefighting operations.

Officials said firefighters have been opening sections of the warehouse to gain better access to the fire and direct more water onto hot spots. While that strategy improves firefighting efforts, it also allows additional oxygen into the building, which can temporarily increase flames and smoke production.

LAFD helicopters continue to make water drops, and officials said the operation is having a significant impact in suppressing the fire. However, smoke and fire conditions are expected to change throughout the incident.

Firefighters are expected to remain on scene for several hours, if not days, to fully extinguish the fire and prevent impacts to surrounding communities.

For up-to-date information about the Palos Fire, follow the LA Fire Department alerts and news.