Sacramento, California - 8 August 2018

1. Various of kids playing indoors at YMCA Sacramento day camp

2. Various of playground equipment not being used

3. SOUNDBITE (English) Jay Lowden, president of YMCA of Superior California

"The wildfires and the air quality and lack of good air quality has impacted our camps. We have to keep the kids inside more. A lot of the outdoor physical activities we've had to curtail and cut back on. And it's frustrating because the kids are spending more time inside. They get a little bit of cabin fever."

4. California State Capitol building in hazy air

5. Sacramento River and skyline in hazy air

6. SOUNDBITE (English) Lori Kobza, spokeswoman, Sacramento Metropolitan Air Quality Management District

"We're just most concerned right now with the wildfire smoke and the particulate matter. So we do encourage people to stay indoors and limit their outside activities."

7. Screen showing air quality index

8. Kobza on computer showing air quality map

9. Screen showing air quality map of Sacramento region

10. SOUNDBITE (English) Lori Kobza, spokeswoman, Sacramento Metropolitan Air Quality Management District

"Now the Mendocino Complex Fires right now are so huge are burning over 300,000 acres and they are contributing the majority of the smoke. Right now however we are still seeing impacts from the Carr Fire, which is burning up near Redding and the Ferguson Fire which is burning in the Yosemite Valley area."

11. Various of kids playing indoors at YMCA day camp

12. SOUNDBITE (English) Braylin Sligar, YMCA camp director

"So air quality wise, so it limits our outdoor time which is hard during summer because it's all about being outdoors and using the outdoors to have fun and to play. So we've had to incorporate a lot more indoor activities in developing our programme to accommodate the weather."

13. Boys playing basketball in gym

14. SOUNDBITE (English) Sean Nolasco, 11, YMCA day camper

"It's a very good idea to have a stay indoors because sometimes the pollution can make us sick and stuff."

15. Kids sitting in gym with camp counselor

No major wildfires are burning near Sacramento but for two weeks a dull haze and the faint smell of smoke from distant blazes has blanketed California's capital region.

It's forced summer campers to stay inside, obscured normally bright skylines and left ash on cars.

Winds often blow smoky air around California during intense fires, but Sacramento air quality experts say it's rare for the dirty air to linger for so long, a reality of ever-larger fires that take longer to extinguish.

The haze stretches to the Sierra Nevada mountain range and nearly every major population center in between has suffered air quality considered dangerous for children, the elderly and people with asthma.

There are two major wildfires - one called the Mendocino Complex Fire that is the largest in California history - burning more than 100 miles (160 kilometers) north of Sacramento and another huge fire near Yosemite National Park a little farther to the southeast.