keyword

is carbon dioxide toxic to humans

Monthly search volume and cost-per-click data for "is carbon dioxide toxic to humans" in US.

$ curl "https://api.seodata.dev/v1/keyword?q=is+carbon+dioxide+toxic+to+humans&country=us" +--------------+------------------+ | volume | 90 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-06-28 | +--------------+------------------+

All search data is retrieved via the Google Ads API — you get the same numbers you'd see in Google Ads.

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword	volume	cpc	overlap
is co2 toxic	390	$0	14/20
is carbon dioxide toxic	320	$0.07	13/20
co2 toxic	170	$0	16/20
carbon dioxide toxic	140	$0	14/20
carbon dioxide harmful	140	$0	13/20
is carbon dioxide harmful to humans	140	$0	13/20
is co2 deadly	90	$0	14/20
why is carbon dioxide toxic	50	$0	14/20
is co2 toxic to humans	40	$0	15/20
is co2 dangerous to humans	30	$0	14/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://api.seodata.dev/v1/keyword?q=is+carbon+dioxide+toxic+to+humans&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt