Add AirNow Integration (#40091)

.coveragerc

CODEOWNERS

homeassistant/components/airnow/__init__.py

homeassistant/components/airnow/config_flow.py

homeassistant/components/airnow/const.py

homeassistant/components/airnow/manifest.json

homeassistant/components/airnow/sensor.py

homeassistant/components/airnow/strings.json

homeassistant/components/airnow/translations/en.json

homeassistant/generated/config_flows.py

requirements_all.txt

requirements_test_all.txt

tests/components/airnow/__init__.py

tests/components/airnow/test_config_flow.py